Triangle T(n,k) = T(n-1, k) + T(n-1, k-1) + 7*T(n-2, k-1), read by rows.

Terms

a(0) =2a(1) =7a(2) =7a(3) =2a(4) =94a(5) =2a(6) =2a(7) =341a(8) =341a(9) =2a(10) =2a(11) =357a(12) =1340a(13) =357a(14) =2a(15) =2a(16) =373a(17) =4084a(18) =4084a(19) =373a(20) =2a(21) =2a(22) =389a(23) =6956a(24) =17548a(25) =6956a(26) =389a(27) =2a(28) =2a(29) =405