A264489 Number of (n+1)X(6+1) arrays of permutations of 0..n*7+6 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.

1, 42, 972, 23076, 2186741, 42169152, 2775259622, 98973991195, 4820591214512

Offset

1,2

Comments

Column 6 of A264490.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
..7..8..9.10.11..6.13....7..8..9.10.20.12.13....7..8..3.10.11..6.13
..0..1..2..3..4.19.20....0.15.25..3..4.19..6...14.15.16.17.18..5.20
.21.22.23.24.34.26..5...30.22..1..2.11.26..5...21..0..1..2.34..4.27
.28.15.30.17.32.33.12...28.29.16.31.32.33.34...28..9.30.31.32.33.12
.29.14.31.16.25.18.27...21.14.23.24.17.18.27...29.22.23.24.25.26.19

Crossrefs

Cf. A264490.

Sequence in context: A229564 A004422 A020932 * A036400 A221050 A050988

Adjacent sequences: A264486 A264487 A264488 * A264490 A264491 A264492

Keyword

nonn

Author

R. H. Hardin, Nov 14 2015

Status

approved