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A209825 Number of (n+1)X5 0..2 arrays with every 2X2 subblock having one or two distinct values, and new values 0..2 introduced in row major order 1
1169, 46034, 1842509, 74564193, 3025299170, 122849339000, 4989831357191, 202690028329573, 8233587523146604, 334463675000101972, 13586567965317596307, 551913309230260581903, 22419816737046235524034 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A209829

LINKS

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

FORMULA

Empirical: a(n) = 60*a(n-1) -839*a(n-2) +1399*a(n-3) +31874*a(n-4) -122506*a(n-5) -318771*a(n-6) +1769870*a(n-7) +389301*a(n-8) -8009315*a(n-9) +3097168*a(n-10) +13833529*a(n-11) -8760492*a(n-12) -9461275*a(n-13) +7615892*a(n-14) +2191722*a(n-15) -2581040*a(n-16) +92008*a(n-17) +286200*a(n-18) -54000*a(n-19) -1264*a(n-20) +480*a(n-21)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A185469 A065656 A185468 * A264688 A043432 A065703

Adjacent sequences:  A209822 A209823 A209824 * A209826 A209827 A209828

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2012

STATUS

approved

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Last modified September 27 20:35 EDT 2020. Contains 337388 sequences. (Running on oeis4.)