Number of ways to place a non-attacking black king and white king on an n X n board, up to rotation and reflection.

A357723

Number of ways to place a non-attacking black king and white king on an n X n board, up to rotation and reflection.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =5a(4) =21a(5) =63a(6) =135a(7) =270a(8) =462a(9) =770a(10) =1170a(11) =1755a(12) =2475a(13) =3465a(14) =4641a(15) =6188a(16) =7980a(17) =10260a(18) =12852a(19) =16065a(20) =19665a(21) =24035a(22) =28875a(23) =34650a(24) =40986a(25) =48438a(26) =56550a(27) =65975a(28) =76167a(29) =87885

External references