Number of tetrahedra in the n X n queen graph.

Terms

a(0) =0a(1) =1a(2) =18a(3) =68a(4) =204a(5) =501a(6) =1106a(7) =2208a(8) =4104a(9) =7153a(10) =11858a(11) =18804a(12) =28756a(13) =42581a(14) =61362a(15) =86304a(16) =118864a(17) =160641a(18) =213522a(19) =279556a(20) =361116a(21) =460757a(22) =581394a(23) =726144a(24) =898520a(25) =1102257a(26) =1341522a(27) =1620724a(28) =1944740a(29) =2318709