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A207095
Number of 0..3 arrays x(0..n-1) of n elements with each no smaller than the sum of its two previous neighbors modulo 4.
1
4, 10, 26, 68, 176, 458, 1193, 3103, 8069, 20982, 54556, 141854, 368847, 959072, 2493770, 6484280, 16860367, 43840173, 113992823, 296403114, 770704718, 2003979505, 5210729566, 13548892363, 35229708616, 91603972925, 238187830252
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OFFSET
1,1
COMMENTS
Column 3 of
A207100
LINKS
R. H. Hardin,
Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) -a(n-2) +a(n-3) -3*a(n-4) +a(n-6) -2*a(n-9) +2*a(n-12) +a(n-13) -a(n-16)
EXAMPLE
Some solutions for n=5
..0....2....2....0....2....0....1....2....0....1....2....0....1....0....1....3
..2....3....2....0....3....1....1....3....1....2....2....2....1....0....2....3
..3....1....3....0....2....3....2....3....2....3....2....3....3....3....3....2
..2....3....1....1....3....2....3....3....3....2....3....2....2....3....2....3
..3....2....2....1....1....3....2....2....1....2....3....1....2....3....3....3
CROSSREFS
Sequence in context:
A191605
A277236
A218208
*
A126358
A200051
A200663
Adjacent sequences:
A207092
A207093
A207094
*
A207096
A207097
A207098
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Feb 15 2012
STATUS
approved
