G.f. satisfies: A(x) = x/series_reversion(x/G(x)) where A(x) + A(-x) = 2*G(x^2) and G(x) is the g.f. of A046646.
A116637
G.f. satisfies: A(x) = x/series_reversion(x/G(x)) where A(x) + A(-x) = 2*G(x^2) and G(x) is the g.f. of A046646.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =4a(4) =6a(5) =14a(6) =24a(7) =60a(8) =110a(9) =286a(10) =546a(11) =1456a(12) =2856a(13) =7752a(14) =15504a(15) =42636a(16) =86526a(17) =240350a(18) =493350a(19) =1381380a(20) =2861430a(21) =8064030a(22) =16829280a(23) =47682960a(24) =100134216a(25) =284997384a(26) =601661144a(27) =1719031840a(28) =3645533040a(29) =10450528048
External references
- oeis: A116637