a(n) = (-1)^n*(2*n - 1)*CatalanNumber(n - 2) for n >= 2, a(n) = n for n = 0, 1.
A078718
a(n) = (-1)^n*(2*n - 1)*CatalanNumber(n - 2) for n >= 2, a(n) = n for n = 0, 1.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =-5a(4) =14a(5) =-45a(6) =154a(7) =-546a(8) =1980a(9) =-7293a(10) =27170a(11) =-102102a(12) =386308a(13) =-1469650a(14) =5616324a(15) =-21544100a(16) =82907640a(17) =-319929885a(18) =1237518450a(19) =-4796857230a(20) =18627909300a(21) =-72457790790a(22) =282257178060
External references
- oeis: A078718