Triangle read by rows: T(n,k) = binomial(2*n+1, 2*k+1)*binomial(2*n-2*k, n-k)/(n+1-k) for 0 <= k <= n.

A281000

Triangle read by rows: T(n,k) = binomial(2*n+1, 2*k+1)*binomial(2*n-2*k, n-k)/(n+1-k) for 0 <= k <= n.

Terms

    a(0) =1a(1) =3a(2) =1a(3) =10a(4) =10a(5) =1a(6) =35a(7) =70a(8) =21a(9) =1a(10) =126a(11) =420a(12) =252a(13) =36a(14) =1a(15) =462a(16) =2310a(17) =2310a(18) =660a(19) =55a(20) =1a(21) =1716a(22) =12012a(23) =18018a(24) =8580a(25) =1430a(26) =78a(27) =1a(28) =6435a(29) =60060

External references