A209792 Half the number of (n+1)X5 0..2 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference

9348, 759642, 61289190, 4953638163, 400252237467, 32342700329739, 2613436161921981, 211178329470822063, 17064216751948148973, 1378870531424172401901, 111419341944536370111453

Offset

1,1

Comments

Column 4 of A209796

Links

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

Formula

Empirical: a(n) = 76*a(n-1) +900*a(n-2) -42410*a(n-3) +22649*a(n-4) +5503843*a(n-5) -33812631*a(n-6) -52852804*a(n-7) +896916910*a(n-8) -1240445413*a(n-9) -6887750040*a(n-10) +18088038881*a(n-11) +14908131615*a(n-12) -74462369219*a(n-13) +6262313511*a(n-14) +129707254006*a(n-15) -48725542109*a(n-16) -101163963885*a(n-17) +41149417610*a(n-18) +34422303955*a(n-19) -9155372128*a(n-20) -4187924158*a(n-21) +600253814*a(n-22) +126714760*a(n-23) -13520692*a(n-24) -134544*a(n-25)

Example

Some solutions for n=4
..2..2..2..1..1....1..2..0..0..1....2..1..0..2..1....1..2..2..1..2
..0..2..0..0..1....0..2..0..1..1....2..2..2..2..0....2..2..0..0..2
..0..1..0..1..1....0..1..0..0..2....1..1..0..0..0....1..1..0..2..2
..1..1..2..1..2....1..1..2..0..0....0..0..0..1..0....2..2..2..2..0
..0..0..0..0..2....1..2..2..2..1....0..1..2..1..1....1..1..1..1..0

Crossrefs

Sequence in context: A229435 A022223 A172914 * A004934 A004954 A004974

Adjacent sequences: A209789 A209790 A209791 * A209793 A209794 A209795

Keyword

nonn

Author

R. H. Hardin Mar 13 2012

Status

approved