a(n) = [x^n] (6 / Sum_{k=0..n} (k+3)!*x^k)^(1/2).
A303671
a(n) = [x^n] (6 / Sum_{k=0..n} (k+3)!*x^k)^(1/2).
Terms
- a(0) =1a(1) =-2a(2) =-4a(3) =-20a(4) =-140a(5) =-1192a(6) =-11656a(7) =-127072a(8) =-1517480a(9) =-19624400a(10) =-272656064a(11) =-4046157472a(12) =-63844717184
External references
- oeis: A303671