G.f.: Sum_{k>=0} x^k * Product_{j=1..6*k} (1 + x^j)/(1 - x^j).

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =15a(5) =29a(6) =53a(7) =93a(8) =155a(9) =251a(10) =397a(11) =613a(12) =929a(13) =1385a(14) =2033a(15) =2945a(16) =4219a(17) =5979a(18) =8393a(19) =11683a(20) =16133a(21) =22119a(22) =30125a(23) =40773a(24) =54867a(25) =73435a(26) =97785a(27) =129583a(28) =170941a(29) =224519