A147750 Riordan array ((1-x-x^2)/(1-x-2x^2), x(1-x)/(1-2x)).

1, 0, 1, 1, 1, 1, 1, 3, 2, 1, 3, 6, 6, 3, 1, 5, 14, 15, 10, 4, 1, 11, 30, 38, 29, 15, 5, 1, 21, 66, 92, 81, 49, 21, 6, 1, 43, 142, 220, 216, 150, 76, 28, 7, 1, 85, 306, 516, 560, 435, 253, 111, 36, 8, 1

Offset

0,8

Comments

Row sums are A061646. A147750=A007318^-1*A147747.

Links

Table of n, a(n) for n=0..54.

Example

Triangle begins
1,
0, 1,
1, 1, 1,
1, 3, 2, 1,
3, 6, 6, 3, 1,
5, 14, 15, 10, 4, 1,
11, 30, 38, 29, 15, 5, 1,
21, 66, 92, 81, 49, 21, 6, 1

Crossrefs

Sequence in context: A115215 A335012 A158275 * A089942 A097409 A257556

Adjacent sequences: A147747 A147748 A147749 * A147751 A147752 A147753

Keyword

easy,nonn,tabl

Author

Paul Barry, Nov 11 2008

Status

approved