Triangular array: T(n,k) = T(n,n) = 1, T(n,k) = 5*T(n-1, k-1) + 2*T(n-1, k), read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =7a(5) =1a(6) =1a(7) =19a(8) =37a(9) =1a(10) =1a(11) =43a(12) =169a(13) =187a(14) =1a(15) =1a(16) =91a(17) =553a(18) =1219a(19) =937a(20) =1a(21) =1a(22) =187a(23) =1561a(24) =5203a(25) =7969a(26) =4687a(27) =1a(28) =1a(29) =379