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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =11a(8) =11a(9) =1a(10) =1a(11) =26a(12) =60a(13) =26a(14) =1a(15) =1a(16) =57a(17) =252a(18) =252a(19) =57a(20) =1a(21) =1a(22) =120a(23) =931a(24) =1746a(25) =931a(26) =120a(27) =1a(28) =1a(29) =247