Numerator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.

A193472

Numerator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =25a(6) =1a(7) =427a(8) =1a(9) =12465a(10) =5a(11) =555731a(12) =691a(13) =35135945a(14) =7a(15) =2990414715a(16) =3617a(17) =329655706465a(18) =43867a(20) =174611a(22) =854513a(24) =236364091a(26) =8553103a(28) =23749461029

External references