Generalized tangent numbers d_(n,2).

Terms

a(0) =2a(1) =11a(2) =46a(3) =128a(4) =272a(5) =522a(6) =904a(7) =1408a(8) =2160a(9) =3154a(10) =4306a(11) =5888a(12) =7888a(13) =10012a(14) =12888a(15) =16384a(16) =19680a(17) =24354a(18) =29866a(19) =34816a(20) =41888a(21) =49778a(22) =56744a(23) =66816a(24) =78000a(25) =87358a(26) =100602a(27) =115712a(28) =128112a(29) =145804