73156608000
domain: N
Appears in sequences
- a(n) = n!*(n+2)!/2.at n=8A010791
- Number of integers less than A000108(n) relatively prime to A000108(n).at n=23A062624
- Symmetric triangle of certain normalized products of decreasing factorials.at n=48A090441
- a(n) = (n+2)! * (n+1)! * n! / 2.at n=6A090443
- Catalan number analogs for totienomial coefficients (A238453).at n=22A245798