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A100938 Self-convolution of A092684. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A045621 A026655 A244398 * A018004 A124329 A144520

Adjacent sequences:  A100935 A100936 A100937 * A100939 A100940 A100941

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Nov 23 2004

STATUS

approved

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Last modified April 5 06:13 EDT 2020. Contains 333238 sequences. (Running on oeis4.)