451328

Appears in sequences

• sech(arctan(x)+tan(x))=1-4/2!*x^2+80/4!*x^4-4384/6!*x^6+451328/8!*x^8...at n=4A013008
• Expansion of Product_{m>=1} (1 + q^m)^(2*m).at n=19A026011