A100938 Self-convolution of A092684.

1, 2, 5, 10, 22, 46, 97, 200, 412, 844, 1729, 3536, 7227, 14754, 30093, 61312, 124782, 253664, 515085, 1044796, 2117158, 4286330, 8671103, 17529304, 35416016, 71518510, 144362774, 291299094, 587617054, 1185060666, 2389424213

Offset

0,2

Comments

A092684 is the leftmost column of triangle A092683.

Links

Table of n, a(n) for n=0..30.

Formula

a(n) = 1 + Sum_{k=1..n} Sum_{j=0..n-k} binomial(k, j)*a(j).

Prog

(PARI) {a(n)=1+sum(k=1, n, sum(j=0, n-k, binomial(k, j)*a(j)))}

Crossrefs

Cf. A092684, A092683.

Sequence in context: A026655 A336484 A244398 * A018004 A124329 A144520

Adjacent sequences: A100935 A100936 A100937 * A100939 A100940 A100941

Keyword

nonn

Author

Paul D. Hanna, Nov 23 2004

Status

approved