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

A187509

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

Terms

    a(0) =0a(1) =2a(2) =36a(3) =115a(4) =236a(5) =399a(6) =604a(7) =851a(8) =1140a(9) =1471a(10) =1844a(11) =2259a(12) =2716a(13) =3215a(14) =3756a(15) =4339a(16) =4964a(17) =5631a(18) =6340a(19) =7091a(20) =7884a(21) =8719a(22) =9596a(23) =10515a(24) =11476a(25) =12479a(26) =13524a(27) =14611a(28) =15740a(29) =16911

External references