Number of 4-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.

A187378

Number of 4-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.

Terms

    a(0) =0a(1) =4a(2) =40a(3) =132a(4) =278a(5) =478a(6) =732a(7) =1040a(8) =1402a(9) =1818a(10) =2288a(11) =2812a(12) =3390a(13) =4022a(14) =4708a(15) =5448a(16) =6242a(17) =7090a(18) =7992a(19) =8948a(20) =9958a(21) =11022a(22) =12140a(23) =13312a(24) =14538a(25) =15818a(26) =17152a(27) =18540a(28) =19982a(29) =21478

External references