A229457 Number of defective 3-colorings of an nX6 0..2 array connected horizontally and vertically with exactly one mistake and colors introduced in row-major 0..2 order

40, 1188, 27313, 573342, 11451686, 221410052, 4182294415, 77626332302, 1421182695065, 25734458996766, 461813205678124, 8225319344357866, 145570937702109584, 2562275384434847728, 44887086267708866341

Offset

1,1

Comments

Column 6 of A229460

Links

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

Formula

Empirical: a(n) = 60*a(n-1) -1482*a(n-2) +20016*a(n-3) -167163*a(n-4) +924894*a(n-5) -3537110*a(n-6) +9593166*a(n-7) -18693789*a(n-8) +26218062*a(n-9) -26188161*a(n-10) +18139608*a(n-11) -8262712*a(n-12) +2220864*a(n-13) -266256*a(n-14) for n>15

Example

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

Crossrefs

Sequence in context: A004385 A349596 A152257 * A331350 A061650 A006101

Adjacent sequences: A229454 A229455 A229456 * A229458 A229459 A229460

Keyword

nonn

Author

R. H. Hardin Sep 24 2013

Status

approved