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A264682
Number of (7+1)X(n+1) arrays of permutations of 0..n*8+7 with each element having directed index change -1,-1 1,0 -1,-2 -2,-2 or 0,1.
0
0, 264, 9976, 291315, 17406354, 918298857, 40765995197, 1834679734692, 84286370436052, 3803767919559602, 169217277043021433
OFFSET
1,2
COMMENTS
Row 7 of A264676.
EXAMPLE
Some solutions for n=3
.10..6..1..2....6..0..1..2...10.11..1..2....6..0..1..2...10..0..1..2
..0..4.11..3....9..4..5..3....0.15..5..3....9..4.11..3....9..4.11..3
.18..5..9..7...13.19.15..7....4..8..6..7...13..5.15..7...18..5..6..7
..8.12.13.14....8.12.10.11...17..9.13.14....8.12.10.14....8.12.13.14
.22.23.17.15...26.16.14.18...12.22.23.18...22.16.17.18...22.27.17.15
.16.20.21.19...30.17.21.22...16.27.21.19...25.26.27.19...16.20.21.19
.30.31.25.26...20.31.25.23...20.31.25.26...20.21.31.23...29.31.25.23
.24.28.29.27...24.28.29.27...24.28.29.30...24.28.29.30...24.28.26.30
CROSSREFS
Cf. A264676.
Sequence in context: A288877 A278409 A168196 * A107507 A239183 A289062
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 20 2015
STATUS
approved