-6694

Appears in sequences

• sech(arctan(x)+sin(x))=1-4/2!*x^2+104/4!*x^4-6694/6!*x^6...at n=3A012984
• Expansion of Sum_{k>=0} x^(k^2) / Product_{j=1..k} (1 + j*x^j).at n=30A306707