-1334025domain: ZAppears in sequencesExpansion of log(1+x)/cos(sinh(x)).at n=10A009426Numerator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882.at n=12A095159