Crystal ball sequence for the lattice C_7.

Terms

a(0) =1a(1) =99a(2) =1765a(3) =14407a(4) =74313a(5) =284075a(6) =880685a(7) =2340495a(8) =5529233a(9) =11905267a(10) =23784309a(11) =44673751a(12) =79684825a(13) =136030779a(14) =223619261a(15) =355747103a(16) =549905697a(17) =828705155a(18) =1220925445a(19) =1762702695a(20) =2498858857a(21) =3484382923a(22) =4786071885a(23) =6484339631a(24) =8675201969a(25) =11472445971a(26) =15009991829