G.f.: Sum_{n=-oo..+oo} x^(n^2) * C(x)^(6*n-9), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).
A356779
G.f.: Sum_{n=-oo..+oo} x^(n^2) * C(x)^(6*n-9), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).
Terms
- a(0) =1a(1) =-7a(2) =9a(3) =60a(4) =-265a(5) =429a(6) =-189a(7) =-812a(8) =2925a(9) =-5732a(10) =6980a(11) =-4824a(12) =-198a(13) =10010a(14) =-32298a(15) =69768a(16) =-104651a(17) =107373a(18) =-72435a(19) =26422a(20) =19656a(21) =-115011a(22) =361763a(23) =-834900a(24) =1427679a(25) =-1797817a(26) =1641447a(27) =-1057446a(28) =454155a(29) =-69564
External references
- oeis: A356779