Expansion of w_7/(1 + 13*w_7 + 49*w_7^2) in powers of q, where w_7 = (eta(7*q)/eta(q))^4.

Terms

a(0) =1a(1) =-9a(2) =30a(3) =-15a(4) =-240a(5) =978a(6) =-1463a(7) =-2361a(8) =18201a(9) =-42800a(10) =15624a(11) =227742a(12) =-809028a(13) =1088367a(14) =1593120a(15) =-11383551a(16) =25003158a(17) =-8589729a(18) =-119069358a(19) =403991280a(20) =-521730930a(21) =-736063496a(22) =5088063696a(23) =-10843708302a(24) =3624181875a(25) =48991048836a(26) =-162420646812a(27) =205328313785a(28) =284014016994