T(n,k) = 4*A046802(n,k) - 2*A008518(n,k) - A007318(n,k), triangle read by rows (0 <= k <= n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =1a(6) =1a(7) =15a(8) =15a(9) =1a(10) =1a(11) =32a(12) =82a(13) =32a(14) =1a(15) =1a(16) =65a(17) =330a(18) =330a(19) =65a(20) =1a(21) =1a(22) =130a(23) =1159a(24) =2304a(25) =1159a(26) =130a(27) =1a(28) =1a(29) =259