G.f.: Sum_{n>=1} x^(n*(n-1)/2) * (G(x)^n + 1/G(x)^(n-1)), where G(x) is the g.f. of A268300.
A268302
G.f.: Sum_{n>=1} x^(n*(n-1)/2) * (G(x)^n + 1/G(x)^(n-1)), where G(x) is the g.f. of A268300.
Terms
- a(0) =3a(1) =8a(2) =28a(3) =144a(4) =736a(5) =4024a(6) =22912a(7) =134784a(8) =813476a(9) =5010904a(10) =31379808a(11) =199196320a(12) =1278911808a(13) =8290414024a(14) =54186864896a(15) =356711621984
External references
- oeis: A268302