47071640
domain: N
Appears in sequences
- Alkane (or paraffin) numbers l(12,n).at n=27A018213
- One half of binomial coefficients binomial(2*n-8,9).at n=13A053133
- 10th column of Catalan triangle A009766.at n=17A124088
- Central terms of the triangle in A208101.at n=17A208983
- Number of North-East lattice paths from (0,0) to (n,n) that cross the diagonal y = x horizontally exactly four times.at n=9A268447
- Number of 9-element subsets of [n+9] having an even sum.at n=27A282077
- Number of n-element subsets of [n+9] having an even sum.at n=27A282085
- a(n) = A128899(2*n, n) = 2*binomial(4*n - 1, 3*n) for n >= 1 and a(0) = 1.at n=9A359108