G.f.: 1/(1 - 5*x*C(x)), where C(x) = (1 - sqrt(1 - 4*x))/(2*x) = g.f. for the Catalan numbers A000108.
A076036
G.f.: 1/(1 - 5*x*C(x)), where C(x) = (1 - sqrt(1 - 4*x))/(2*x) = g.f. for the Catalan numbers A000108.
Terms
- a(0) =1a(1) =5a(2) =30a(3) =185a(4) =1150a(5) =7170a(6) =44760a(7) =279585a(8) =1746870a(9) =10916150a(10) =68219860a(11) =426353130a(12) =2664633580a(13) =16653699860a(14) =104084695500a(15) =650526003825
External references
- oeis: A076036