30838

Appears in sequences

• Numbers k such that k! + k + 1 is prime.at n=8A073308
• Number of permutations of 1..n with displacements restricted to {-4,-2,0,1,3}.at n=14A189583
• G.f.: A(x) = exp( Sum_{n>=1} [Sum_{k=0..n} C(n,k)^n * x^k*A(x)^k] * x^n/n ).at n=7A198945
• a(n) = Sum_{k=1..n} k^2*sigma(k), where sigma is A000203.at n=15A319086
• Total number of parts which are powers of 2 in all partitions of n.at n=29A342230