77649

Appears in sequences

• Expansion of e.g.f. x*cos(sinh(x)) (odd powers only).at n=6A009057
• Expansion of e.g.f.: exp(sin(x))*x.at n=13A009206
• Number of singular 2 X 2 matrices over Z(n) (i.e., with determinant = 0).at n=38A020478
• a(n) = least m such that sum of m reciprocal primes starting with n-th prime is >1.at n=35A137368
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 1), (-1, 1, 0), (0, 0, -1), (1, 0, 0)}.at n=13A148015
• Number of non-congruent solutions of x^2 + y^2 + z^2 + t^2 == 0 mod n.at n=38A240547
• Association types for monomials with n arguments in an algebra with two binary operations, one commutative, one noncommutative.at n=8A276277
• Number of non-congruent solutions of x^2+y^2 == z^2+w^2 (mod n).at n=38A316148
• a(n) = Sum_{1 <= x_1, x_2 <= n} sigma( n/gcd(x_1, x_2, n) ).at n=38A373129