Triangle T(n, m) = T(n-1, m-1) + (4m-3)*T(n-1, m) read by rows 1<=m<=n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =1a(6) =1a(7) =31a(8) =15a(9) =1a(10) =1a(11) =156a(12) =166a(13) =28a(14) =1a(15) =1a(16) =781a(17) =1650a(18) =530a(19) =45a(20) =1a(21) =1a(22) =3906a(23) =15631a(24) =8540a(25) =1295a(26) =66a(27) =1a(28) =1a(29) =19531