22992076800
domain: N
Appears in sequences
- a(n) = phi(binomial(2n, n)).at n=19A066973
- a(n) = denominator of b(n), where sum{m>=0} b(m)*x^m/m! = x/(sum{m>=1} H(m) x^m/ m!) = exp(-x)*x/(sum{m>=1} x^m (-1)^(m+1)/(m!*m)). (H(m) = sum{k=1 to m} 1/k.).at n=11A128062
- Number of runs of even entries in all permutations of {1,2,...,n} (the permutation 274831659 has 3 runs of even entries: 2, 48 and 6).at n=11A152668
- Product of nonzero remainders of n mod k, for k = 1,2,3,...,n.at n=23A173392
- Number of permutations of n>1 having exactly 3 points P on the boundary of their bounding square.at n=12A208528
- Irregular triangle read by rows: T(n, k) is the number of k X k matrices using all the integers from 1 to k^2 and having trace equal to n, with 1 <= k <= A003056(n).at n=31A362209