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A220731 Number of ways to reciprocally link elements of an 7Xn array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors 0

%I

%S 1,64,9667,3751888,1208447287,418227762771,141539684300104,

%T 48392485908572308

%N Number of ways to reciprocally link elements of an 7Xn array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors

%C Row 7 of A220725

%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 .69.47.00...00.00.00...69.49.00...00.67.47...69.49.00...00.69.47...00.00.00

%e .36.14.00...00.79.00...00.16.14...39.36.47...00.17.17...69.34.17...00.79.00

%e .69.47.00...36.46.14...69.46.47...00.13.00...36.34.00...00.13.00...36.49.17

%e .39.17.00...00.00.00...00.13.00...00.00.00...69.49.00...00.67.47...00.36.14

%e .36.14.00...00.00.00...00.79.00...00.79.00...00.17.17...39.37.00...00.79.00

%e .00.67.47...69.49.00...39.67.14...36.46.14...39.37.00...39.19.00...39.67.14

%e .36.34.00...00.16.14...36.14.00...00.00.00...36.14.00...00.16.14...36.14.00

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 18 2012

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Last modified October 17 04:49 EDT 2021. Contains 348048 sequences. (Running on oeis4.)