Number of semi-magic (only short lines are magic) knight's tours on a 4 X n board.
A309273
Number of semi-magic (only short lines are magic) knight's tours on a 4 X n board.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =9a(7) =16a(8) =38a(9) =104a(10) =267a(11) =608a(12) =1444a(13) =3480a(14) =8221a(15) =19212a(16) =45262a(17) =213280a(18) =250247a(19) =587072a(20) =1378912a(21) =3237456
External references
- oeis: A309273