G.f.: Product_{m>0} (1+x^m+2!*x^(2*m)).

Terms

a(0) =1a(1) =1a(2) =3a(3) =2a(4) =6a(5) =7a(6) =12a(7) =13a(8) =22a(9) =26a(10) =42a(11) =46a(12) =73a(13) =80a(14) =116a(15) =139a(16) =194a(17) =226a(18) =306a(19) =358a(20) =482a(21) =558a(22) =735a(23) =856a(24) =1108a(25) =1300a(26) =1657a(27) =1926a(28) =2426a(29) =2834