Partition numbers of the form 9k.

Terms

a(0) =135a(1) =297a(2) =792a(3) =1575a(4) =10143a(5) =31185a(6) =63261a(7) =329931a(8) =15796476a(9) =44108109a(10) =4835271870a(11) =7346629512a(12) =12292341831a(13) =18440293320a(14) =107438159466a(15) =129913904637a(16) =156919475295a(17) =250438925115