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

A156763

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

Terms

    a(0) =2a(1) =3a(2) =3a(3) =7a(4) =12a(5) =7a(6) =21a(7) =42a(8) =42a(9) =21a(10) =71a(11) =160a(12) =180a(13) =160a(14) =71a(15) =253a(16) =660a(17) =770a(18) =770a(19) =660a(20) =253a(21) =925a(22) =2814a(23) =3570a(24) =3360a(25) =3570a(26) =2814a(27) =925a(28) =3433a(29) =12068

External references