A265923 Number of n X 3 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, 9005175397018238976, 85862124616319762432

Offset: 1

Author

R. H. Hardin, Dec 18 2015

Keywords

• nonn

Examples

			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
		

Links

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

Crossrefs

Column 3 of A265928.

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.