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 A220744 Number of ways to reciprocally link elements of an 7 X n array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links. 0

%I #5 Mar 15 2023 14:09:39

%S 1,64,3403,355883,32924133,3287610473,319803318494,31411054258761,

%T 3063698245151388

%N Number of ways to reciprocally link elements of an 7 X n array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.

%C Row 7 of A220738.

%e Some solutions for n=3 0=self 1=nw 3=ne 4=w 6=e 7=sw 9=se (reciprocal directions total 10)

%e .00.00.00...00.79.00...00.69.47...00.67.47...00.00.00...69.49.00...00.67.47

%e .00.00.00...39.69.14...00.36.14...39.39.00...00.67.47...00.17.17...36.34.00

%e .00.79.00...00.16.14...00.69.47...00.17.17...36.34.00...36.34.00...00.00.00

%e .39.79.17...69.47.00...00.36.14...36.34.00...69.49.00...69.47.00...00.69.47

%e .39.13.17...36.14.00...00.79.00...69.47.00...69.14.17...36.14.00...00.36.14

%e .00.13.00...69.47.00...39.69.14...39.17.00...00.13.00...69.47.00...00.00.00

%e .00.00.00...36.14.00...00.16.14...36.14.00...00.00.00...36.14.00...00.00.00

%Y Cf. A220738.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 18 2012

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Last modified December 2 03:27 EST 2023. Contains 367505 sequences. (Running on oeis4.)