1622016
domain: N
Appears in sequences
- a(0) = 1; a(n) = LCM(n, sum{k=0 to n-1}[a(k)]).at n=11A057827
- 17-almost primes (generalization of semiprimes).at n=26A069278
- Number of permutations of length n containing exactly once 132 and 213, likewise for pattern pair (231,312).at n=16A089264
- Number of directed Hamiltonian paths in the 2n-crossed prism graph.at n=9A137885
- a(n) is the number of subsets of {1..n} that contain exactly 5 odd numbers.at n=22A331420
- a(n) = ((n-1)^2 + 2)*2^(n-2).at n=14A356888
- a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-k) * binomial(2*k+2,2*n-6*k+1).at n=17A387555