Crystal ball sequence for D_4 lattice.

Terms

a(0) =1a(1) =25a(2) =169a(3) =625a(4) =1681a(5) =3721a(6) =7225a(7) =12769a(8) =21025a(9) =32761a(10) =48841a(11) =70225a(12) =97969a(13) =133225a(14) =177241a(15) =231361a(16) =297025a(17) =375769a(18) =469225a(19) =579121a(20) =707281a(21) =855625a(22) =1026169a(23) =1221025a(24) =1442401a(25) =1692601a(26) =1974025a(27) =2289169a(28) =2640625a(29) =3031081