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A046995
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Greek-key tours on a 4 X n board; i.e., self-avoiding walks on 4 X n grid starting in top left corner.
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6
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1, 4, 17, 52, 160, 469, 1337, 3750, 10347, 28249, 76382, 204996, 546651, 1449952, 3828232, 10067585, 26384939, 68941126, 179658343, 467084601, 1211812016, 3138075544, 8112667259, 20941558268, 53983767498
(list;
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internal format)
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