A263421 Number of nX3 arrays of permutations of 0..n*3-1 with each element moved a city block distance of 0 or 2.

2, 36, 1272, 26244, 532620, 11751184, 256052940, 5521233025, 119493228528, 2588597823744, 56036432705840, 1213019187980625, 26261187063569212, 568530651822400656, 12307989647701123268, 266454168798496644900

Offset: 1

Author

R. H. Hardin, Oct 17 2015

Keywords

• nonn

Comments

Column 3 of A263424.

Examples

			Some solutions for n=4
..2..7..0....4..1..8....2..1..0....6..3..2....4..3..2....0..5..8....6..3..0
..3.10..1....9..2.11....5..4.11....1..0..7....1..0..5....3..2..1....1..2.11
..4..5..8....0..7..6....6..3..8....8..5.10....8..7.10....4.11.10....8..9.10
..9..6.11....3.10..5....7.10..9...11..4..9....9..6.11....9..6..7....7..4..5
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 64

Crossrefs

Cf. A263424.

Formula

Empirical recurrence of order 64 (see link above)