Expansion of (1/(1 - x))*Sum_{k>=0} k!*x^(k*(k+1)/2)/Product_{j=1..k} (1 - x^j).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =9a(5) =14a(6) =25a(7) =38a(8) =57a(9) =84a(10) =141a(11) =206a(12) =307a(13) =440a(14) =633a(15) =984a(16) =1419a(17) =2036a(18) =2887a(19) =4064a(20) =5619a(21) =8370a(22) =11667a(23) =16424a(24) =22717a(25) =31478a(26) =42783a(27) =58386a(28) =82701a(29) =113162