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A264556 Number of (7+1)X(n+1) arrays of permutations of 0..n*8+7 with each element having directed index change -1,1 -1,2 1,0 or 0,-1. 1
0, 93, 1204, 23140, 813473, 25172836, 591482528, 15554895920, 426023121887, 11212094301173, 288664400022091, 7526121840247476, 196724860860294913, 5099876575111214715, 131971387912281226253, 3420386371154190796380 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 7 of A264550.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..73

EXAMPLE

Some solutions for n=4

..1..2..3..4..7....1..2..5..6..8....1..2..3..4..8....1..2..6..4..8

..0.10..8.11.13....0..7.10..3..4....0..7.11.12.13....0..7.10..3.12

..5..6.15.14..9...11.12.15.17..9....5..6.15.16..9....5.15.13.14..9

.16.20.12.22.23...16.20.18.13.14...10.17.20.19.14...16.11.20.19.23

.21.25.17.18.19...21.22.23.24.19...21.22.23.18.28...21.22.17.18.27

.26.27.30.32.24...26.27.30.31.33...26.27.30.32.24...26.30.28.29.24

.31.35.33.28.29...25.32.35.28.29...25.35.33.37.29...25.35.33.37.38

.36.37.38.39.34...36.37.38.39.34...36.31.38.39.34...36.31.32.39.34

CROSSREFS

Cf. A264550.

Sequence in context: A160174 A238693 A160250 * A250373 A250374 A146125

Adjacent sequences:  A264553 A264554 A264555 * A264557 A264558 A264559

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2015

STATUS

approved

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Last modified June 20 19:36 EDT 2019. Contains 324234 sequences. (Running on oeis4.)