-7733

Appears in sequences

• Numerator of [x^n] of the Taylor series arccosh(exp(x) - arcsin(x)).at n=9A013306
• 1-gonal pyramidal numbers.at n=36A254749
• a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(n+1,2*k+1) * Catalan(k).at n=16A360048