Expansion of Product_{k>=1} (1 + x^k + x^(k+2)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =6a(6) =7a(7) =11a(8) =15a(9) =20a(10) =28a(11) =36a(12) =50a(13) =62a(14) =86a(15) =105a(16) =141a(17) =175a(18) =226a(19) =283a(20) =358a(21) =446a(22) =557a(23) =691a(24) =852a(25) =1055a(26) =1286a(27) =1587a(28) =1918a(29) =2353