Triangle T(n, k) = A143491(n+2, k+2) + A143491(n+2, n-k+2), read by rows.

Terms

a(0) =2a(1) =3a(2) =3a(3) =7a(4) =10a(5) =7a(6) =25a(7) =35a(8) =35a(9) =25a(10) =121a(11) =168a(12) =142a(13) =168a(14) =121a(15) =721a(16) =1064a(17) =735a(18) =735a(19) =1064a(20) =721a(21) =5041a(22) =8055a(23) =5399a(24) =3330a(25) =5399a(26) =8055a(27) =5041a(28) =40321a(29) =69299