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A116394 Expansion of 1/((1+x)*sqrt(1-2x-3x^2)-x). 1
1, 1, 4, 11, 33, 100, 305, 937, 2890, 8943, 27741, 86216, 268355, 836297, 2608818, 8144875, 25446229, 79545148, 248780979, 778400001, 2436380402, 7628211951, 23890103153, 74836927720, 234478937321, 734802907841, 2303073316042 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Diagonal sums of number triangle A116392.

LINKS

Table of n, a(n) for n=0..26.

FORMULA

a(n)=sum{k=0..floor(n/2), A116392(n-k,k)}.

CROSSREFS

Sequence in context: A236583 A282990 A099159 * A259442 A127154 A062460

Adjacent sequences:  A116391 A116392 A116393 * A116395 A116396 A116397

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Feb 12 2006

STATUS

approved

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Last modified October 22 02:46 EDT 2018. Contains 316431 sequences. (Running on oeis4.)