A204073 Number of (n+1)X6 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.
4688, 221726, 11081828, 563880962, 28864215128, 1480470688070, 75985220860460, 3900809853901802, 200268432775804640, 10282077911857180910, 527901424170345081716, 27103536327800063656274, 1391552121866875493481704
Offset: 1
Keywords
Examples
Some solutions for n=4 ..0..0..0..1..2..1....0..0..1..1..0..1....0..1..1..2..0..1....0..0..1..0..0..0 ..2..0..0..0..1..2....1..0..0..1..1..0....2..0..1..1..2..0....2..0..0..2..0..0 ..2..2..0..1..0..1....0..1..0..0..1..1....2..2..0..1..1..2....2..2..0..0..2..0 ..1..2..2..0..1..2....1..0..2..0..0..1....2..1..2..0..1..1....1..2..2..0..0..0 ..2..2..1..2..0..1....2..1..0..1..0..0....0..2..2..2..0..1....1..1..2..2..0..2
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Formula
Empirical: a(n) = 78*a(n-1) -1521*a(n-2) +7304*a(n-3) +32884*a(n-4) -338760*a(n-5) +639312*a(n-6) +947424*a(n-7) -3942080*a(n-8) +2598528*a(n-9) +1739776*a(n-10) -1832448*a(n-11) -14336*a(n-12) +163840*a(n-13)
Comments