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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 1
28602, 2826144, 263929692, 24157113543, 2194611652359, 198813266559054, 17991495416997300, 1627464551425873818, 147193282684219789893, 13311853653618989194317, 1203868850769998755908516 (list; graph; refs; listen; history; text; internal format)
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 A179251

Adjacent sequences:  A234825 A234826 A234827 * A234829 A234830 A234831

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2013

STATUS

approved

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Last modified January 18 18:56 EST 2018. Contains 297864 sequences.