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A250356
Number of length 7 arrays x(i), i=1..7 with x(i) in i..i+n and no value appearing more than 2 times.
2
128, 1791, 12620, 59406, 214716, 644040, 1681860, 3932472, 8409252, 16713576, 31259100, 55546440, 94493292, 154825032, 245530836, 378390360, 568576020, 835335912, 1202762412, 1700651496, 2365457820, 3241350600, 4381375332
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OFFSET
1,1
COMMENTS
Row 7 of
A250351
LINKS
R. H. Hardin,
Table of n, a(n) for n = 1..91
FORMULA
Empirical: a(n) = n^7 + 7*n^6 - 14*n^5 + 105*n^4 + 105*n^3 - 532*n^2 + 1252*n - 744 for n>4
EXAMPLE
Some solutions for n=4
..1....1....2....2....2....1....1....0....0....2....4....3....1....0....1....3
..3....3....1....1....3....2....4....1....4....1....2....2....3....5....4....2
..2....2....2....5....4....3....6....6....4....4....2....4....5....2....6....6
..3....4....6....7....7....7....7....5....6....6....7....6....5....3....6....4
..6....4....4....5....4....6....6....6....5....6....4....5....6....7....5....5
..5....9....6....9....9....6....7....9....6....5....5....7....6....6....7....5
..7....6...10...10....7...10...10....7....8....9....9....7....8...10...10....7
CROSSREFS
Sequence in context:
A332545
A269081
A200789
*
A269587
A232053
A250234
Adjacent sequences:
A250353
A250354
A250355
*
A250357
A250358
A250359
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Nov 19 2014
STATUS
approved
