Number of 5-turn bishop's tours on an n X n board summed over all starting positions.

Terms

a(0) =0a(1) =0a(2) =8a(3) =584a(4) =5464a(5) =26360a(6) =91120a(7) =252720a(8) =603696a(9) =1288592a(10) =2525400a(11) =4620728a(12) =7998984a(13) =13219528a(14) =21014336a(15) =32306400a(16) =48256608a(17) =70282656a(18) =100115880a(19) =139819944a(20) =191858360a(21) =259112216a(22) =344959120a(23) =453289232a(24) =588596368a(25) =755991600