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A236620 Number of (n+1)X(1+1) 0..3 arrays colored with the maximum plus the lower median of every 2X2 subblock 1
256, 2624, 26560, 272160, 2793840, 28623360, 293206144, 3004474720, 30787484400, 315466604800, 3232443987328, 33121714435232, 339386917161584, 3477578105724160, 35633504005053312, 365123791082829024 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236624

LINKS

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

FORMULA

Empirical: a(n) = 304*a(n-3) +4012*a(n-4) +21408*a(n-5) +131544*a(n-6) +480256*a(n-7) +1095762*a(n-8) +2382528*a(n-9) -7588872*a(n-10) -47015904*a(n-11) -158803396*a(n-12) -569595744*a(n-13) -679250552*a(n-14) -333197568*a(n-15) +2056975591*a(n-16) +18914327296*a(n-17) +34799954216*a(n-18) +64591344816*a(n-19) +115113338336*a(n-20) -23416566272*a(n-21) -143590120832*a(n-22) -350090976000*a(n-23) -1031067717376*a(n-24) -1144206867456*a(n-25) -1239076647936*a(n-26) -1669973962752*a(n-27) -1104748867584*a(n-28) -692833222656*a(n-29) -631651958784*a(n-30) -206009008128*a(n-31)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A235559 A235556 A236624 * A236505 A236501 A235752

Adjacent sequences:  A236617 A236618 A236619 * A236621 A236622 A236623

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 29 2014

STATUS

approved

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Last modified May 21 15:06 EDT 2019. Contains 323443 sequences. (Running on oeis4.)