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.
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
Keywords
Examples
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, ...}.