Expansion of a q-series used by Ramanujan in his Lost Notebook.

Terms

a(0) =1a(1) =4a(2) =10a(3) =22a(4) =44a(5) =82a(6) =145a(7) =248a(8) =410a(9) =658a(10) =1036a(11) =1598a(12) =2420a(13) =3614a(14) =5322a(15) =7738a(16) =11132a(17) =15850a(18) =22353a(19) =31260a(20) =43366a(21) =59708a(22) =81650a(23) =110932a(24) =149788a(25) =201112a(26) =268562a(27) =356790a(28) =471732a(29) =620834