G.f.: A(x) = exp( Sum_{n>=1} sigma(n)*|A002129(n)|*x^n/n ).

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =16a(5) =28a(6) =57a(7) =118a(8) =238a(9) =432a(10) =792a(11) =1491a(12) =2759a(13) =4836a(14) =8522a(15) =15126a(16) =26419a(17) =45114a(18) =76883a(19) =130792a(20) =220578a(21) =367144a(22) =608252a(23) =1005102a(24) =1649904a(25) =2684354a(26) =4349068a(27) =7022762a(28) =11278628a(29) =18002603