Coordination sequence for A_6 lattice.

Terms

a(0) =1a(1) =42a(2) =462a(3) =2562a(4) =9492a(5) =27174a(6) =65226a(7) =137886a(8) =264936a(9) =472626a(10) =794598a(11) =1272810a(12) =1958460a(13) =2912910a(14) =4208610a(15) =5930022a(16) =8174544a(17) =11053434a(18) =14692734a(19) =19234194a(20) =24836196a(21) =31674678a(22) =39944058a(23) =49858158a(24) =61651128a(25) =75578370a(26) =91917462a(27) =110969082