Crystal ball sequence for the lattice C_5.

Terms

a(0) =1a(1) =51a(2) =501a(3) =2471a(4) =8361a(5) =22363a(6) =50973a(7) =103503a(8) =192593a(9) =334723a(10) =550725a(11) =866295a(12) =1312505a(13) =1926315a(14) =2751085a(15) =3837087a(16) =5242017a(17) =7031507a(18) =9279637a(19) =12069447a(20) =15493449a(21) =19654139a(22) =24664509a(23) =30648559a(24) =37741809a(25) =46091811a(26) =55858661a(27) =67215511a(28) =80349081