283640

Appears in sequences

• sech(tan(x)+sin(x))=1-4/2!*x^2+72/4!*x^4-3318/6!*x^6+283640/8!*x^8...at n=4A012947
• a(n)=a(n-1)+6a(n-2), n>2.at n=11A140796