A265923 Number of nX3 0..4 arrays with the absolute differences of each element with its with horizontal and antidiagonal neighbors unique.

92, 1740, 17936, 174000, 1671744, 15962560, 152267520, 1451371264, 13834836992, 131883277312, 1257236156416, 11986527891456, 114277874876416, 1089597587963904, 10388632576131072, 99054000222699520, 944443268554031104

Offset

1,1

Comments

Column 3 of A265928.

Links

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

Formula

Empirical: a(n) = 8*a(n-1) +96*a(n-2) -736*a(n-3) -2464*a(n-4) +20480*a(n-5) +13312*a(n-6) -196096*a(n-7) +78592*a(n-8) +600064*a(n-9) -589824*a(n-10) for n>13

Example

Some solutions for n=4
..1..4..0....2..3..1....2..1..3....1..4..4....0..0..3....0..4..1....2..4..0
..2..3..1....0..0..4....1..0..4....0..1..3....1..1..2....2..1..4....4..0..3
..3..1..4....3..4..0....2..1..3....1..0..0....4..0..0....3..4..0....2..1..1
..2..0..1....1..0..4....1..4..0....2..3..1....3..2..2....2..2..1....4..3..3

Crossrefs

Cf. A265928.

Sequence in context: A232795 A269439 A269623 * A249236 A166824 A248451

Adjacent sequences: A265920 A265921 A265922 * A265924 A265925 A265926

Keyword

nonn

Author

R. H. Hardin, Dec 18 2015

Status

approved