49752

Appears in sequences

• a(1) = 1, a(2) = 3, a(n+2) = 3*a(n+1) + (n + 1)*(n + 3)*a(n).at n=6A142988
• a(n) is the number of convex pentagons in an n-triangular net.at n=16A176646
• Expansion of f(x^2)^2 / f(-x) in powers of x where f() is a Ramanujan theta function.at n=42A260163
• a(n) = (1/24)*(n + 3)*(3*n^3 + 5*n^2 - 6*n + 16).at n=23A290061
• Number of nX7 0..1 arrays with every element equal to 0, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.at n=9A298666