Triangular array read by rows: T(n,k) = A002884(k)*2^((n-k)(n-k-1)), n >= 0, 0 <= k <= n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =1a(5) =6a(6) =64a(7) =4a(8) =6a(9) =168a(10) =4096a(11) =64a(12) =24a(13) =168a(14) =20160a(15) =1048576a(16) =4096a(17) =384a(18) =672a(19) =20160a(20) =9999360a(21) =1073741824a(22) =1048576a(23) =24576a(24) =10752a(25) =80640a(26) =9999360a(27) =20158709760a(29) =1073741824a(30) =6291456