A217960 Number of nX4 arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..2 nX4 array.

17, 321, 5415, 93765, 1602741, 27317977, 465184959, 7919256577, 134805742899, 2294680520773, 39060078023831, 664879775228995, 11317562137329901, 192647146079979077, 3279232808653682467, 55818982418231563527

Offset: 1

Author

R. H. Hardin Oct 16 2012

Keywords

• nonn

Comments

Column 4 of A217964

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..38

Formula

Empirical: a(n) = 19*a(n-1) -23*a(n-2) -144*a(n-3) -675*a(n-4) +378*a(n-5) +3291*a(n-6) +4937*a(n-7) -1247*a(n-8) -12054*a(n-9) -12369*a(n-10) -5436*a(n-11) -816*a(n-12) +744*a(n-13) +364*a(n-14) +100*a(n-15) for n>16