OFFSET
1,2
COMMENTS
Every 0 is next to 0 1's, every 1 is next to 1 3's, every 2 is next to 2 2's, every 3 is next to 3 4's, every 4 is next to 4 0's
Column 6 of A196922
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 11*a(n-1) -30*a(n-2) +34*a(n-3) -174*a(n-4) +374*a(n-5) -645*a(n-6) -1568*a(n-7) -3864*a(n-8) -2737*a(n-9) +19896*a(n-10) +39789*a(n-11) +53807*a(n-12) -25645*a(n-13) -97487*a(n-14) -31786*a(n-15) +356123*a(n-16) +927682*a(n-17) +716971*a(n-18) -1120870*a(n-19) -3680755*a(n-20) -3507819*a(n-21) +1342053*a(n-22) +7156543*a(n-23) +6759831*a(n-24) -751579*a(n-25) -7948456*a(n-26) -7605926*a(n-27) -1091182*a(n-28) +4551985*a(n-29) +4822652*a(n-30) +1470465*a(n-31) -1156354*a(n-32) -1454677*a(n-33) -488873*a(n-34) +58506*a(n-35) +204668*a(n-36) +24265*a(n-37) +17367*a(n-38) +2506*a(n-39) +1238*a(n-40) +3804*a(n-41) -6754*a(n-42) +876*a(n-43) -504*a(n-44) +432*a(n-45) for n>46
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..0....0..0..0..0..2..2....0..0..0..2..2..2....0..0..2..2..2..0
..0..4..0..0..2..2....2..2..0..0..2..2....0..4..0..2..0..2....2..2..2..0..2..0
..0..0..4..0..2..2....2..2..0..0..0..0....0..0..0..2..0..2....2..0..0..2..2..0
..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..2..2..2....2..2..2..2..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 07 2011
STATUS
approved