-2224

Appears in sequences

• Expansion of e.g.f. exp(arcsin(tanh(x))).at n=9A012123
• sinh(arcsin(tanh(x)))=x-4/5!*x^5+80/7!*x^7-2224/9!*x^9+88960/11!*x^11...at n=4A012127
• a(n) = Sum_{k=0..floor(n/4)} (-1)^k * binomial(n+3,4*k+3) * Catalan(k).at n=13A360050