A267976 Number of 2Xn 0..3 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.

16, 256, 4096, 62500, 929296, 13498276, 192321424, 2695374889, 37241280400, 508180785424, 6858511503376, 91659848427225, 1214228383808400, 15957351268208100, 208196756833645584, 2698422754887026244

Offset: 1

Author

R. H. Hardin, Jan 23 2016

Keywords

• nonn

Comments

Row 2 of A267974.

Examples

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

Links

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

Crossrefs

Cf. A267974.

Formula

Empirical: a(n) = 70*a(n-1) -2030*a(n-2) +30793*a(n-3) -246680*a(n-4) +794920*a(n-5) +1553979*a(n-6) -13039450*a(n-7) -13949950*a(n-8) [phone]*a(n-9) [phone]*a(n-10) [phone]*a(n-11) [phone]*a(n-12) -13949950*a(n-13) -13039450*a(n-14) +1553979*a(n-15) +794920*a(n-16) -246680*a(n-17) +30793*a(n-18) -2030*a(n-19) +70*a(n-20) -a(n-21)