330429
domain: N
Appears in sequences
- Number of symmetric types of (5,2n)-hypergraphs under action of complementing group C(5,2).at n=7A055788
- Number of permutations of [n] with exactly 2 descents which avoid the pattern 1324.at n=18A098992
- a(n) = n*(n+1)*(n+2)*(n+3)*(1+3*n+n^2)/120.at n=16A101094
- Convolution of nonzero heptagonal numbers (A000566) with themselves.at n=16A272103