-3574

Appears in sequences

• Expansion of e.g.f.: sech(tanh(x)+log(x+1))=1-4/2!*x^2+6/3!*x^3+77/4!*x^4-340/5!*x^5...at n=6A013128
• Sequence with Hankel transform equal to the Somos-4 sequence A006769(n+2).at n=15A178072