Crystal ball sequence for the A4 x A4 lattice.

Terms

a(0) =1a(1) =41a(2) =661a(3) =5741a(4) =33001a(5) =142001a(6) =494341a(7) =1465661a(8) =3833941a(9) =9073501a(10) =19789001a(11) =40328641a(12) =77620661a(13) =142282141a(14) =250054001a(15) =423621001a(16) =694880441a(17) =1107728161a(18) =1721435341a(19) =2614694501a(20) =3890418001a(21) =5681377241a(22) =8156775661a(23) =11529853541