Palindromic binomial coefficients C(n,k) for k >= 2.

Terms

a(0) =3a(1) =6a(2) =55a(3) =66a(4) =171a(5) =252a(6) =595a(7) =666a(8) =969a(9) =1001a(10) =1771a(11) =2002a(12) =3003a(13) =3003a(14) =3003a(15) =5005a(16) =5995a(17) =8008a(18) =8778a(19) =15051a(20) =66066a(21) =617716a(22) =646646a(23) =828828a(24) =1269621a(25) =1680861a(26) =3262623a(27) =3544453a(28) =5073705a(29) =5676765