Triangle T(n,k) = A060187(n+2,k+2), 1<=k<=n.

Terms

a(0) =6a(1) =23a(2) =23a(3) =76a(4) =230a(5) =76a(6) =237a(7) =1682a(8) =1682a(9) =237a(10) =722a(11) =10543a(12) =23548a(13) =10543a(14) =722a(15) =2179a(16) =60657a(17) =259723a(18) =259723a(19) =60657a(20) =2179a(21) =6552a(22) =331612a(23) =2485288a(24) =4675014a(25) =2485288a(26) =331612a(27) =6552a(28) =19673a(29) =1756340