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A220716 Number of ways to reciprocally link elements of an nX5 array either to themselves or to exactly two king-move neighbors, without consecutive collinear links 1
1, 463, 21195, 2126423, 168897201, 14158198781, 1166906554415, 96567512189416, 7981186640240601, 659847172787561616, 54547074666150602023, 4509337888390693628506, 372777382369854018831622 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A220718

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..129

EXAMPLE

Some solutions for n=3 0=self 1=nw 2=n 3=ne 4=w 6=e 7=sw 8=s 9=se (reciprocal directions total 10)

.00.68.49.79.00...00.00.00.68.48...89.00.68.49.00...00.69.48.00.78

.00.29.38.16.14...68.48.69.24.27...29.18.29.69.14...68.47.12.38.27

.00.00.12.00.00...26.24.00.13.00...00.12.00.16.14...23.00.00.23.00

CROSSREFS

Sequence in context: A293025 A108834 A233310 * A189830 A050424 A111697

Adjacent sequences:  A220713 A220714 A220715 * A220717 A220718 A220719

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 18 2012

STATUS

approved

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Last modified December 2 07:40 EST 2020. Contains 338868 sequences. (Running on oeis4.)