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A086608
Row sums of triangle A086606: the sum of the first n terms of the n-th self-convolution of the sequence formed by flattening triangle A086606.
3
1, 3, 13, 51, 221, 993, 4530, 20939, 97285, 455133, 2140073, 10109361, 47933432, 227989548, 1087308518, 5197510491, 24895494553, 119461041021, 574151728723, 2763435409221, 13317800106750, 64257410265249, 310367127210417, 1500548876309897, 7261253691617671
OFFSET
1,2
EXAMPLE
Given A086606={1,_1,2,_1,3,9,_1,4,14,32,_1,5,20,55,140, ...},
a(2)=3=1+2 since A086606^2={1,2, ...},
a(3)=13=1+3+9 since A086606^3={1,3,9, ...},
a(4)=51=1+4+14+32 since A086606^4={1,4,14,32, ...},
a(5)=221=1+5+20+55+140 since A086606^5={1,5,20,55,140, ...}.
CROSSREFS
Cf. A086606 (triangle), A086607 (diagonal).
Sequence in context: A323266 A146279 A098619 * A291182 A037772 A037660
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 23 2003
STATUS
approved