Triangle t(n,m) = 2*A022166(n,m)-binomial(n,m), read by rows, 0<=m<=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) =64a(13) =26a(14) =1a(15) =1a(16) =57a(17) =300a(18) =300a(19) =57a(20) =1a(21) =1a(22) =120a(23) =1287a(24) =2770a(25) =1287a(26) =120a(27) =1a(28) =1a(29) =247