Binomial transform of reduced tangent numbers (A002105).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =31a(6) =110a(7) =400a(8) =1757a(9) =7861a(10) =41402a(11) =220540a(12) =1358183a(13) =8405203a(14) =59340710a(15) =418689544a(16) =3335855897a(17) =26440317193a(18) =234747589106