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A171670

Triangle T read by rows : T(n,k)= A007318(n,k)*A005773(n-k).

1, 1, 1, 2, 2, 1, 5, 6, 3, 1, 13, 20, 12, 4, 1, 35, 65, 50, 20, 5, 1, 96, 210, 195, 100, 30, 6, 1, 267, 672, 735, 455, 175, 42, 7, 1, 750, 2136, 2688, 1960, 910, 280, 56, 8, 1, 2123, 6750, 9612, 8064, 4410, 1638, 420, 72, 9, 1

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OFFSET

0,4

LINKS

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

FORMULA

Sum_{k, 0<=k<=n} T(n,k)= A024718(n).

EXAMPLE

Triangle begins : 1 ; 1,1 ; 2,2,1 ; 5,6,3,1 ; 13,20,12,4,1 ; 35,65,50,20,5,1 ; ...

CROSSREFS

Cf. A171651

Sequence in context: A393254 A118806 A328646 * A124644 A259691 A056857

Adjacent sequences: A171667 A171668 A171669 * A171671 A171672 A171673

KEYWORD

nonn,tabl

AUTHOR

Philippe Deléham, Dec 14 2009

STATUS

approved

URL: https://oeis.org/A171670

⇱ A171670 - OEIS