Coordination sequence for D_9 lattice.

Terms

a(0) =1a(1) =144a(2) =4194a(3) =50832a(4) =361602a(5) =1801872a(6) =6976866a(7) =22413456a(8) =62407170a(9) =155242640a(10) =352624482a(11) =743284368a(12) =1471858818a(13) =2764261008a(14) =4960898658a(15) =8559218832a(16) =14267189250a(17) =23069454480a(18) =36308034146a(19) =55779559056a(20) =83851169922a(21) =123597332112a(22) =178959948642a(23) =254934282384a(24) =357783327234