A234828 Number of (n+1)X(4+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

28602, 2826144, 263929692, 24157113543, 2194611652359, 198813266559054, 17991495416997300, 1627464551425873818, 147193282684219789893, 13311853653618989194317, 1203868850769998755908516

Offset

1,1

Comments

Column 4 of A234832

Links

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

Formula

Empirical: a(n) = 182*a(n-1) -11600*a(n-2) +364517*a(n-3) -6574557*a(n-4) +74167355*a(n-5) -550713612*a(n-6) +2763264852*a(n-7) -9403512254*a(n-8) +21143341630*a(n-9) -28417525706*a(n-10) +11657297214*a(n-11) +38663386597*a(n-12) -104056918812*a(n-13) +134565850437*a(n-14) -58332448151*a(n-15) -136233194984*a(n-16) +312098619191*a(n-17) -313931961777*a(n-18) +175500893116*a(n-19) -48707250480*a(n-20) +560589885*a(n-21) +2754659691*a(n-22) +330478353*a(n-23) -654517260*a(n-24) +209271843*a(n-25) -30114261*a(n-26) +2018601*a(n-27) -59049*a(n-28)

Example

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

Crossrefs

Sequence in context: A017536 A013869 A256841 * A263116 A252908 A341326

Adjacent sequences: A234825 A234826 A234827 * A234829 A234830 A234831

Keyword

nonn

Author

R. H. Hardin, Dec 31 2013

Status

approved