Triangle read by rows: T(n,k) = 2*k*T(n-1,n-1) + 1 (n >= 0, 0 <= k <= n), with T(0,0) = 1.

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =7a(5) =13a(6) =1a(7) =27a(8) =53a(9) =79a(10) =1a(11) =159a(12) =317a(13) =475a(14) =633a(15) =1a(16) =1267a(17) =2533a(18) =3799a(19) =5065a(20) =6331a(21) =1a(22) =12663a(23) =25325a(24) =37987a(25) =50649a(26) =63311a(27) =75973a(28) =1a(29) =151947