a(n) = [x^n] exp(Sum_{k>=1} (-1)^(k+1)*x^k*(1 + (n - 3)*x^k)/(k*(1 - x^k)^3)).
A318124
a(n) = [x^n] exp(Sum_{k>=1} (-1)^(k+1)*x^k*(1 + (n - 3)*x^k)/(k*(1 - x^k)^3)).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =9a(4) =31a(5) =127a(6) =494a(7) =1994a(8) =8040a(9) =32741a(10) =133855a(11) =549775a(12) =2266756a(13) =9372300a(14) =38862245a(15) =161500403a(16) =672538548a(17) =2805669061a(18) =11723319333a(19) =49055511943a(20) =205534846202a(21) =862167483656
External references
- oeis: A318124