20118067200
domain: N
Appears in sequences
- a(n) = n!*(n+5)!/5!.at n=7A010794
- Number of adjacent pairs of form (odd,odd) among all permutations of {1,2,...,n}.at n=12A077611
- Number of adjacent pairs of form (even,odd) among all permutations of {1,2,...,n}. Also, number of adjacent pairs of form (odd,even).at n=12A077613
- Expansion of e.g.f.: sqrt(1+2x)/sqrt(1-2x).at n=11A110491
- Number of permutations of [n] starting and ending with an odd number.at n=14A199495
- a(n) = n!*tribonacci(n+2).at n=11A364324