Number of 7-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.

A187381

Number of 7-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) =0a(2) =18a(3) =324a(4) =1418a(5) =3448a(6) =6581a(7) =10688a(8) =15769a(9) =21824a(10) =28853a(11) =36856a(12) =45833a(13) =55784a(14) =66709a(15) =78608a(16) =91481a(17) =105328a(18) =120149a(19) =135944a(20) =152713a(21) =170456a(22) =189173a(23) =208864a(24) =229529a(25) =251168a(26) =273781a(27) =297368a(28) =321929a(29) =347464

External references