Coordination sequence for C_7 lattice.

Terms

a(0) =1a(1) =98a(2) =1666a(3) =12642a(4) =59906a(5) =209762a(6) =596610a(7) =1459810a(8) =3188738a(9) =6376034a(10) =11879042a(11) =20889442a(12) =35011074a(13) =56345954a(14) =87588482a(15) =132127842a(16) =194158594a(17) =278799458a(18) =392220290a(19) =541777250a(20) =736156162a(21) =985524066