277456

Appears in sequences

• Expansion of tan(arcsin(sinh(x))) (odd powers only).at n=4A012101
• Expansion of e.g.f. exp(arctanh(sinh(x))).at n=9A012261
• Triangular array read by rows: a(n, k) = sum of number of ordered factorizations of all prime signatures with n total prime factors and k distinct prime factors.at n=33A095705
• Number of (n+1)X(n+1) -5..5 symmetric matrices with every 2X2 subblock having sum zero and two or three distinct values.at n=12A211332
• Number of vertices in a complete bipartite graph where the vertices in the two parts are placed on opposite sides of a parabola at integer y coordinates y = 1, 2, ...n.at n=32A392442