306432

Appears in sequences

• a(n) = the number of permutations (p(1), p(2), ..., p(n)) of (1,2,...,n) where, for each k (2 <= k <= n), the sign of (p(k) - p(k-1)) equals the sign of (p(n+2-k) - p(n+1-k)).at n=10A137782
• Theta series of extremal lattice of dimension 14, level 7 and minimal norm 6.at n=9A169719
• Numbers k such that sigma(sigma(k^4)) == 0 (mod k^2).at n=40A320425
• Expansion of g.f. (Sum_{i>=0} (i! - 1)*x^i)/(Sum_{i>=0} i!*x^i).at n=9A387674