-68000

Appears in sequences

• E.g.f.: log(sech(x)+sinh(x))=x-2/2!*x^2+6/3!*x^3-20/4!*x^4+120/5!*x^5...at n=8A013206
• a(n) = (-1)^n * Sum_{i=0..n} binomial(n+1,i+1)*Catalan(i).at n=9A050511
• G.f.: A(x) satisfies: A( 6*x - 5*A(x) ) = x - 16*x^2.at n=4A292814