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⇱ A115363 - OEIS

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A115363
((1,x)-(x,x^2))^(-2) (using Riordan array notation).
1
1, 2, 1, 0, 0, 1, 3, 2, 0, 1, 0, 0, 0, 0, 1, 0, 0, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 4, 3, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 2, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 3, 0, 0, 2, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1
OFFSET
0,2
COMMENTS
Square of number triangle A115361. Row sums are A115364.
EXAMPLE
Triangle begins
1,
2, 1,
0, 0, 1,
3, 2, 0, 1,
0, 0, 0, 0, 1,
0, 0, 2, 0, 0, 1,
0, 0, 0, 0, 0, 0, 1,
4, 3, 0, 2, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 2, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
0, 0, 3, 0, 0, 2, 0, 0, 0, 0, 0, 1,
CROSSREFS
Sequence in context: A335964 A301570 A301567 * A327191 A036867 A036866
KEYWORD
nonn,tabl
AUTHOR
Paul Barry, Jan 21 2006
STATUS
approved