a(n) = A065176(n + 2) * n! * [x^n](exp(x) / (1 + cos(x))).

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =5a(5) =11a(6) =111a(7) =305a(8) =235a(9) =781a(10) =5733a(11) =22475a(12) =48065a(13) =217751a(14) =8527167a(15) =43899265a(16) =30286495a(17) =174772921a(18) =2148821763a(19) =13744073645a(20) =46580213525a(21) =327156548291