A264302 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change 0,1 0,-2 1,0 or -1,0.

1, 20, 89, 332, 1952, 10449, 51825, 271385, 1423312, 7377473, 38384768, 199921136, 1040944841, 5418020729, 28200226049, 146829523292, 764363230209, 3978793059292, 20713653589248, 107832120979057, 561339614901057

Offset

1,2

Comments

Row 3 of A264299.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..5..0..1..2..3....5..3..1..2..9....5..6..1..2..3....5..6..7..2..9
..7.11..9.13..4....0.11..6..7..4....0.11..9..7..4....0..1.12..3..4
.12..6.14..8.19...12.13.14..8.19...12.10.14..8.19...15.13.14..8.19
.10.15.16.17.18...10.15.16.17.18...17.15.16.13.18...10.11.16.17.18

Crossrefs

Cf. A264299.

Sequence in context: A249983 A234258 A213839 * A220200 A242656 A264851

Adjacent sequences: A264299 A264300 A264301 * A264303 A264304 A264305

Keyword

nonn

Author

R. H. Hardin, Nov 11 2015

Status

approved