A264590 Number of (7+1)X(n+1) arrays of permutations of 0..n*8+7 with each element having directed index change 1,0 0,-1 1,2 or -1,1.

0, 64, 112, 8185, 145761, 2561017, 80571013, 1370091018, 31774873994, 739068221512, 14799398641932, 342162301457503, 7365870400027166, 159579067502624284

Offset

1,2

Comments

Row 7 of A264583.

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=4
..1..2..3..4..8....1..5..6..4..8....1..2..3..4..8....1..2..3..4..8
..6..7..0..9.13....0..7..2..3.13....6..7..0.12.13....6.10..0..9.13
.11.12..5.17.18...11.12.16.14..9...11.15..5.17..9....5.15..7.17.18
.10.20.21.22.14...10.20.18.22.23...10.20.18.22.14...16.11.12.19.14
.15.16.23.24.19...15.25.17.24.19...21.16.23.27.19...21.22.23.27.28
.26.27.28.32.33...26.27.28.21.33...26.30.28.29.24...26.30.20.32.24
.25.35.36.37.29...31.35.36.34.29...25.35.33.37.38...25.35.33.37.29
.30.31.38.39.34...30.37.38.39.32...36.31.32.39.34...36.31.38.39.34

Crossrefs

Cf. A264583.

Sequence in context: A039481 A094682 A118158 * A221258 A357390 A195678

Adjacent sequences: A264587 A264588 A264589 * A264591 A264592 A264593

Keyword

nonn

Author

R. H. Hardin, Nov 18 2015

Status

approved