(n+1)^2*a(n+1) = -(9*n^2 + 9*n + 3)*a(n) - 27*n^2*a(n-1), with a(0) = 1 and a(1) = -3.
A291898
(n+1)^2*a(n+1) = -(9*n^2 + 9*n + 3)*a(n) - 27*n^2*a(n-1), with a(0) = 1 and a(1) = -3.
Terms
- a(0) =1a(1) =-3a(2) =9a(3) =-21a(4) =9a(5) =297a(6) =-2421a(7) =12933a(8) =-52407a(9) =145293a(10) =-35091a(11) =-2954097a(12) =25228971a(13) =-142080669a(14) =602217261a(15) =-1724917221a(16) =283305033a(17) =38852066421a(18) =-337425235479
External references
- oeis: A291898