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A206017 Number of (n+1) X 5 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases. 1
29000, 996840, 35846696, 1312173688, 48253100168, 1777528400280, 65511284596104, 2414878151153112, 89021936674135848, 3281765839316864856, 120981986260584562856, 4459999657858077035160, 164417954579332945638152 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A206021.

LINKS

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

FORMULA

Empirical: a(n) = 73*a(n-1) -1405*a(n-2) -9006*a(n-3) +550293*a(n-4) -3226784*a(n-5) -64698042*a(n-6) +780081867*a(n-7) +2346501573*a(n-8) -68662886739*a(n-9) +93731120441*a(n-10) +3154407527874*a(n-11) -11890171481287*a(n-12) -82161309754656*a(n-13) +501671387469894*a(n-14) +1143196223588069*a(n-15) -12056563185847086*a(n-16) -3826663441607398*a(n-17) +184512660593511032*a(n-18) -150145877878682976*a(n-19) -1864089811990081992*a(n-20) +3034451755180958208*a(n-21) +12432559015698179504*a(n-22) -29599525853335433572*a(n-23) -52671543250516909564*a(n-24) +177240916872533885384*a(n-25) +123792583544789254952*a(n-26) -685239899102755367656*a(n-27) -56998357266108410952*a(n-28) +1708805750517705815904*a(n-29) -528296446743022830832*a(n-30) -2649609385302607095056*a(n-31) +1555567715222504562048*a(n-32) +2332304793361410805568*a(n-33) -1928766058178162978624*a(n-34) -910814527604835851648*a(n-35) +1088982840749961021184*a(n-36) +1717062648561323520*a(n-37) -206961682948689803264*a(n-38) +43329007122068668416*a(n-39) +1906473273083363328*a(n-40) -460400574988812288*a(n-41)

EXAMPLE

Some solutions for n=3:

..0..1..0..3..2....3..2..0..1..0....3..2..1..1..2....2..1..1..1..0

..2..1..2..3..1....3..1..0..2..3....1..2..3..0..3....2..3..0..3..3

..3..0..2..0..1....0..1..3..2..0....0..0..3..1..1....2..1..0..1..2

..3..1..1..0..2....0..2..3..1..0....1..2..2..2..3....0..1..2..1..0

CROSSREFS

Sequence in context: A235820 A235817 A235576 * A250762 A249465 A257391

Adjacent sequences: A206014 A206015 A206016 * A206018 A206019 A206020

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 02 2012

STATUS

approved

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Last modified January 31 01:17 EST 2023. Contains 359947 sequences. (Running on oeis4.)