Triangle read by rows: T(n,k) = M(2n+1,k,-1), 0 <= k <= n, n >= 0, array M as in A050144.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =2a(6) =1a(7) =5a(8) =9a(9) =5a(10) =1a(11) =7a(12) =20a(13) =28a(14) =14a(15) =1a(16) =9a(17) =35a(18) =75a(19) =90a(20) =42a(21) =1a(22) =11a(23) =54a(24) =154a(25) =275a(26) =297a(27) =132a(28) =1a(29) =13