Triangle T(n,k) with T(n,0)=1 and T(n,k) = (2^(n+1)-2^k)*T(n,k-1) + T(n+1,k-1) otherwise.

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =7a(5) =43a(6) =1a(7) =15a(8) =211a(9) =2619a(10) =1a(11) =31a(12) =931a(13) =26251a(14) =654811a(15) =1a(16) =63a(17) =3907a(18) =234795a(19) =13255291a(20) =662827803a(21) =1a(22) =127a(23) =16003a(24) =1985131a(25) =238658491a(26) =26961325147a(28) =1a(29) =255a(30) =64771