Crystal ball sequence for D_9 lattice.

Terms

a(0) =1a(1) =145a(2) =4339a(3) =55171a(4) =416773a(5) =2218645a(6) =9195511a(7) =31608967a(8) =94016137a(9) =249258777a(10) =601883259a(11) =1345167627a(12) =2817026445a(13) =5581287453a(14) =10542186111a(15) =19101404943a(16) =33368594193a(17) =56438048673a(18) =92746082819a(19) =148525641875a(20) =232376811797a(21) =355974143909a(22) =534934092551a(23) =789868374935