Character of extremal vertex operator algebra of rank 21/2.

Terms

a(0) =1a(1) =0a(2) =273a(3) =1225a(4) =6699a(5) =24276a(6) =83727a(7) =249273a(8) =706251a(9) =1849449a(10) =4634679a(11) =11043102a(12) =25418694a(13) =56429226a(14) =121771023a(15) =255577105a(16) =524104602a(17) =1051048467a(18) =2067033325a(19) =3990581847a(20) =7577271786a(21) =14163504079a(22) =26096985684a(23) =47437304901a(24) =85152306694a(25) =151047652140a(26) =264977541885