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 A128602 Row sums of triangle A128567. 3
 1, 3, 12, 60, 315, 1869, 11472, 74797, 502908, 3505031, 24973089, 182208083, 1352620790, 10207771213, 78082422354, 604699597868, 4733082767467, 37406134058641, 298165102770381, 2395219866441531, 19376637845028027, 157757577529194488, 1291926016200778464 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A128567 is the matrix square of Parker's partition triangle A047812. LINKS Table of n, a(n) for n=1..23. FORMULA a(n) = Sum_{s=0..n-1} A047812(n,s)*A000108(s+1) for n >= 1. - Petros Hadjicostas, May 31 2020 PROG (PARI) {a(n)=local(M); M=matrix(n+1, n+1, r, c, if(r

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Last modified September 30 07:44 EDT 2023. Contains 365781 sequences. (Running on oeis4.)