Triangle read by rows: T(n,m) = (1 + 2 * binomial(n,m))^n for 0 <= m <= n, n >= 0.

Terms

a(0) =1a(1) =3a(2) =3a(3) =9a(4) =25a(5) =9a(6) =27a(7) =343a(8) =343a(9) =27a(10) =81a(11) =6561a(12) =28561a(13) =6561a(14) =81a(15) =243a(16) =161051a(17) =4084101a(18) =4084101a(19) =161051a(20) =243a(21) =729a(22) =4826809a(23) =887503681a(24) =4750104241a(25) =887503681a(26) =4826809a(27) =729a(28) =2187a(29) =170859375