40864824000
domain: N
Appears in sequences
- a(n) = denominator(b(n)), where b(1) = b(2) = 1, b(n) = (b(n-1) + b(n-2))/(n-1).at n=15A069944
- n-th derivative of arctan(x) at x = 1, n >= 4.at n=13A177146
- a(n) = A091137(n) / A016116(n).at n=12A195338
- Triangle read by rows: T(n,m) is the number of inequivalent n X m matrices under action of the Klein group, with one-ninth each of 1's, 2's, 3's, 4's, 5's, 6's, 7's, 8's and 9's (ordered occurrences rounded up/down if n*m != 0 mod 9).at n=14A287383
- Number of labeled dihedral groups with a fixed identity.at n=7A336412