Number of 8-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.

A187382

Number of 8-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) =0a(3) =404a(4) =2140a(5) =6380a(6) =13220a(7) =22996a(8) =35366a(9) =50330a(10) =67888a(11) =88040a(12) =110786a(13) =136126a(14) =164060a(15) =194588a(16) =227710a(17) =263426a(18) =301736a(19) =342640a(20) =386138a(21) =432230a(22) =480916a(23) =532196a(24) =586070a(25) =642538a(26) =701600a(27) =763256a(28) =827506a(29) =894350

External references