Number of 9-step E, S, NW and NE-moving king's tours on an n X n board summed over all starting positions.

A187592

Number of 9-step E, 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) =13a(3) =2792a(4) =27252a(5) =103108a(6) =246792a(7) =458018a(8) =732810a(9) =1069534a(10) =1468190a(11) =1928778a(12) =2451298a(13) =3035750a(14) =3682134a(15) =4390450a(16) =5160698a(17) =5992878a(18) =6886990a(19) =7843034a(20) =8861010a(21) =9940918a(22) =11082758a(23) =12286530a(24) =13552234a(25) =14879870a(26) =16269438a(27) =17720938a(28) =19234370

External references