A264524 Number of (6+1)X(n+1) arrays of permutations of 0..n*7+6 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.

0, 0, 576, 10368, 186624, 2856816, 43731769, 696507612, 11093144976, 178795599948, 2881767670929, 45735094197492, 725838818428816, 11506986415823456, 182424435028933696, 2894261482434465920

Offset: 1

Author

R. H. Hardin, Nov 16 2015

Keywords

• nonn

Comments

Row 6 of A264520.

Examples

			Some solutions for n=4
..7..6..0..1..2....7..6..9..1..2....7..8..9..1..2....5..8..7..1..2
.12.13..5..3..4....0.13..5..3..4....0.11.14..3..4....0.13.14..3..4
.15.18.17..8..9...15.16.10..8.12....5..6.19.18.12...15..6.10.11..9
.10.11.24.16.14...20.11.22.23.14...10.23.22.13.17...22.23.12.16.17
.27.28.20.21.19...27.28.17.18.19...15.16.20.21.29...27.28.20.18.19
.32.33.22.23.34...32.21.34.33.24...30.31.34.33.24...32.21.34.33.24
.25.26.30.31.29...25.26.30.31.29...25.26.27.28.32...25.26.30.31.29
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..26

Crossrefs

Cf. A264520.