A205820 Number of (n+1) X 6 0..2 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases.
1344, 8274, 53100, 380568, 2791080, 20842578, 156410676, 1177361316, 8870853996, 66873761742, 504225673728, 3802217597802, 28672407717948, 216221748724626, 1630562796353904, 12296378355562308, 92729406038121768, 699291160811405796
Offset: 1
Keywords
Examples
Some solutions for n=4: ..1..0..1..0..0..2....0..2..1..2..2..2....0..0..0..0..1..0....2..1..1..0..1..0 ..2..0..2..2..1..1....1..2..0..0..1..0....1..2..1..2..1..2....2..0..2..0..2..0 ..1..1..1..0..0..2....0..2..1..2..1..2....0..2..0..2..0..2....1..0..1..0..1..0 ..2..0..2..2..1..1....1..2..0..2..0..2....1..1..0..1..0..1....2..0..2..2..2..2 ..1..0..1..0..0..2....0..2..1..1..0..1....0..2..2..1..2..1....1..0..1..0..1..0
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Formula
Empirical: a(n) = 7*a(n-1) +53*a(n-2) -357*a(n-3) -1079*a(n-4) +7394*a(n-5) +11581*a(n-6) -84118*a(n-7) -73551*a(n-8) +594925*a(n-9) +284936*a(n-10) -2793237*a(n-11) -633322*a(n-12) +9049520*a(n-13) +497598*a(n-14) -20718745*a(n-15) +1367131*a(n-16) +34016824*a(n-17) -5176803*a(n-18) -40382375*a(n-19) +8617455*a(n-20) +34762108*a(n-21) -8910046*a(n-22) -21645081*a(n-23) +6188645*a(n-24) +9664248*a(n-25) -2958595*a(n-26) -3042270*a(n-27) +974466*a(n-28) +655984*a(n-29) -217442*a(n-30) -92260*a(n-31) +31633*a(n-32) +7754*a(n-33) -2784*a(n-34) -325*a(n-35) +127*a(n-36) +4*a(n-37) -2*a(n-38).
Comments