OFFSET
1,2
COMMENTS
Every 0 is next to 0 2's, every 1 is next to 1 4's, every 2 is next to 2 3's, every 3 is next to 3 0's, every 4 is next to 4 1's
Column 5 of A196786
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +18*a(n-2) +75*a(n-3) +214*a(n-4) +573*a(n-5) +1067*a(n-6) +496*a(n-7) -6999*a(n-8) -22187*a(n-9) -27738*a(n-10) -36490*a(n-11) +38397*a(n-12) +191499*a(n-13) +139688*a(n-14) +174635*a(n-15) +145499*a(n-16) -220926*a(n-17) -251717*a(n-18) -362124*a(n-19) -163792*a(n-20) +83311*a(n-21) -300598*a(n-22) +162970*a(n-23) -92220*a(n-24) +10134*a(n-25) -10370*a(n-26) -8340*a(n-27) +8044*a(n-28) -432*a(n-29) +448*a(n-30) -128*a(n-31)
EXAMPLE
Some solutions for n=4
..0..0..3..0..0....0..1..0..3..0....0..3..0..0..0....0..0..0..0..0
..0..0..0..3..0....1..4..1..0..0....3..0..0..0..3....0..0..3..0..0
..0..0..0..3..0....0..1..0..0..3....0..0..0..0..0....3..0..3..0..0
..0..0..0..0..0....0..0..0..3..0....0..3..0..0..0....0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 06 2011
STATUS
approved