a(n) = [x^(n*(n+2))] Sum_{m>=0} x^m * (1 - x^(m+1))^m / (1 + x^(m+1))^(m+1).
A323696
a(n) = [x^(n*(n+2))] Sum_{m>=0} x^m * (1 - x^(m+1))^m / (1 + x^(m+1))^(m+1).
Terms
- a(0) =1a(1) =-3a(2) =15a(3) =-93a(4) =323a(5) =-1753a(6) =8991a(7) =-58747a(8) =268541a(9) =-1462761a(10) =8097455a(11) =-76494807a(12) =251595971a(13) =-1409934009a(14) =9674895101a(15) =-46242141689a(16) =252055236611
External references
- oeis: A323696