Character of extremal vertex operator algebra of rank 15.

Terms

a(0) =1a(1) =0a(2) =255a(3) =3640a(4) =27525a(5) =154056a(6) =713850a(7) =2878920a(8) =10432650a(9) =34739200a(10) =107930865a(11) =316293000a(12) =881570320a(13) =2352362160a(14) =6040988775a(15) =14993606776a(16) =36092638500a(17) =84513447480a(18) =192980579410a(19) =430636071000a(20) =940847483976