G.f.: A(x) = Series_Reversion(x*G(x)) where G(x) = Sum_{n>=0} (-x)^(n*(n+1)/2).
A192540
G.f.: A(x) = Series_Reversion(x*G(x)) where G(x) = Sum_{n>=0} (-x)^(n*(n+1)/2).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =70a(6) =255a(7) =960a(8) =3707a(9) =14597a(10) =58382a(11) =236522a(12) =968597a(13) =4003061a(14) =16674858a(15) =69936760a(16) =295092057a(17) =1251747436a(18) =5334958079a(19) =22834290248a(20) =98108081192a(21) =422986894605
External references
- oeis: A192540