Galton triangle T(n, k) = T(n-1, k-1) + (3k-2)*T(n-1, k) read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =21a(8) =12a(9) =1a(10) =1a(11) =85a(12) =105a(13) =22a(14) =1a(15) =1a(16) =341a(17) =820a(18) =325a(19) =35a(20) =1a(21) =1a(22) =1365a(23) =6081a(24) =4070a(25) =780a(26) =51a(27) =1a(28) =1a(29) =5461