A234827 Number of (n+1)X(3+1) 0..2 arrays with each 2X2 subblock having the number of clockwise edge increases less than or equal to the number of counterclockwise edge increases

3843, 161631, 6566460, 263929692, 10572386472, 423046102605, 16922003634471, 676811269740528, 27068730475090632, 1082588035969280076, 43296916055230905366, 1731610426247501412189, 69253743854202407932599

Offset

1,1

Comments

Column 3 of A234832

Links

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

Formula

Empirical: a(n) = 69*a(n-1) -1465*a(n-2) +13735*a(n-3) -65766*a(n-4) +174137*a(n-5) -265580*a(n-6) +234847*a(n-7) -111244*a(n-8) +19238*a(n-9) +45*a(n-10) -6*a(n-11) +72*a(n-12) -9*a(n-13)

Example

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

Crossrefs

Sequence in context: A179747 A237371 A061404 * A253291 A253161 A185773

Adjacent sequences: A234824 A234825 A234826 * A234828 A234829 A234830

Keyword

nonn

Author

R. H. Hardin, Dec 31 2013

Status

approved