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A220552 Number of ways to reciprocally link elements of an n X 7 array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor. 1
21, 5536, 940432, 174911750, 32001129185, 5873481159019, 1077372801893440, 197644957649145164, 36257360400073221806, 6651328207323063530996, 1220169722761405665767328, 223837152224277574339972896 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A220553.
LINKS
EXAMPLE
Some solutions for n=3 0=self 2=n 3=ne 4=w 6=e 7=sw 8=s (reciprocal directions total 10)
..0..7..7..7..0..0..0....0..7..8..8..0..6..4....0..7..7..6..4..6..4
..3..3..3..7..7..7..0....3..0..2..2..0..0..7....3..3..7..0..6..4..0
..0..0..3..3..3..0..0....0..6..4..0..0..3..0....0..3..0..0..6..4..0
CROSSREFS
Cf. A220553.
Sequence in context: A203370 A232344 A074053 * A275053 A028451 A178327
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 2012
STATUS
approved

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Last modified April 17 05:47 EDT 2024. Contains 371756 sequences. (Running on oeis4.)