39940

Appears in sequences

• Expansion of e.g.f. sec(exp(x)*log(x+1)).at n=8A012279
• Numbers k such that abs(prime(k)-k*tau(k)) < sqrt(k).at n=36A068543
• Number of 5 X n (0,1) matrices such that each row and each column is nondecreasing or nonincreasing.at n=9A086115
• 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, 0, 0), (1, -1, 1), (1, 0, -1), (1, 1, 0)}.at n=9A149274
• Number of perfect matchings in the twisted graph (C_4 X C_n)_{(13)(24)}.at n=7A220868