Triangle read by rows, T(n,k) = Sum_{j=k..n} A269940(n,j)*A269939(j,k), for n>=0 and 0<=k<=n.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =5a(5) =9a(6) =0a(7) =41a(8) =210a(9) =225a(10) =0a(11) =469a(12) =5115a(13) =14175a(14) =11025a(15) =0a(16) =6889a(17) =142492a(18) =763350a(19) =1455300a(20) =893025a(21) =0a(22) =123605a(23) =4566149a(24) =41943090a(25) =146522250a(26) =212837625a(27) =108056025a(28) =0a(29) =2620169