Expansion of phi_{7, 2}(x) where phi_{r, s}(x) = Sum_{n, m>0} m^r * n^s * x^{m*n}.

Terms

a(0) =0a(1) =1a(2) =132a(3) =2196a(4) =16912a(5) =78150a(6) =289872a(7) =823592a(8) =2164800a(9) =4802733a(10) =10315800a(11) =19487292a(12) =37138752a(13) =62748686a(14) =108714144a(15) =171617400a(16) =277094656a(17) =410338962a(18) =633960756a(19) =893872100a(20) =1321672800a(21) =1808608032a(22) =2572322544a(23) =3404825976a(24) =4753900800a(25) =6105469375a(26) =8282826552