Coordination sequence for C_6 lattice.

Terms

a(0) =1a(1) =72a(2) =912a(3) =5336a(4) =20256a(5) =58728a(6) =142000a(7) =301560a(8) =581184a(9) =1038984a(10) =1749456a(11) =2805528a(12) =4320608a(13) =6430632a(14) =9296112a(15) =13104184a(16) =18070656a(17) =24442056a(18) =32497680a(19) =42551640a(20) =54954912a(21) =70097384a(22) =88409904a(23) =110366328a(24) =136485568a(25) =167333640a(26) =203525712a(27) =245728152a(28) =294660576