Number of Greek-key tours on a 3 X n board; i.e., self-avoiding walks on a 3 X n grid starting in the top left corner.

A046994

Number of Greek-key tours on a 3 X n board; i.e., self-avoiding walks on a 3 X n grid starting in the top left corner.

Terms

    a(0) =1a(1) =3a(2) =8a(3) =17a(4) =38a(5) =78a(6) =164a(7) =332a(8) =680a(9) =1368a(10) =2768a(11) =5552a(12) =11168a(13) =22368a(14) =44864a(15) =89792a(16) =179840a(17) =359808a(18) =720128a(19) =1440512a(20) =2882048a(21) =5764608a(22) =11531264a(23) =23063552a(24) =46131200a(25) =92264448a(26) =184537088a(27) =369078272a(28) =738172928a(29) =1476354048

External references