a(n) = A128899(2*n, n) = 2*binomial(4*n - 1, 3*n) for n >= 1 and a(0) = 1.
A359108
a(n) = A128899(2*n, n) = 2*binomial(4*n - 1, 3*n) for n >= 1 and a(0) = 1.
Terms
- a(0) =1a(1) =2a(2) =14a(3) =110a(4) =910a(5) =7752a(6) =67298a(7) =592020a(8) =5259150a(9) =47071640a(10) =423830264a(11) =3834669566a(12) =34834267234a(13) =317506779800
External references
- oeis: A359108