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A236139 Number of (n+1)X(1+1) 0..3 arrays colored with the maximum plus the upper median plus the minimum minus the lower median of every 2X2 subblock 1
256, 2976, 34734, 405132, 4726586, 55128306, 643062117, 7501428048, 87503440684, 1020696761684, 11906221249064, 138884581545880, 1620064510360004, 18897718794998460, 220438366796098656, 2571374957387040176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236142

LINKS

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

FORMULA

Empirical: a(n) = 476*a(n-3) +6828*a(n-4) +42328*a(n-5) +261628*a(n-6) +939596*a(n-7) +1141424*a(n-8) -5531408*a(n-9) -77255920*a(n-10) -353396376*a(n-11) -894119952*a(n-12) -1389075520*a(n-13) +5482024400*a(n-14) +35751673856*a(n-15) +90044584192*a(n-16) +154625904768*a(n-17) -247634417920*a(n-18) -1941041280512*a(n-19) -3666475576320*a(n-20) -3881308749824*a(n-21) +10379052684288*a(n-22) +55618412687360*a(n-23) +57311677382656*a(n-24) -29077267808256*a(n-25) -220194357346304*a(n-26) -620840327184384*a(n-27) -114135561601024*a(n-28) +1580499698188288*a(n-29) +1200720990175232*a(n-30) -655072073613312*a(n-31) -1208870658637824*a(n-32) -1743801332793344*a(n-33) -259325561929728*a(n-34) +1825629737582592*a(n-35) +753137564516352*a(n-36) -225950646140928*a(n-37) -218161118969856*a(n-38) -176903260471296*a(n-39)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A236592 A236589 A236142 * A235747 A235506 A235502

Adjacent sequences:  A236136 A236137 A236138 * A236140 A236141 A236142

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 19 2014

STATUS

approved

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Last modified October 22 18:45 EDT 2021. Contains 348175 sequences. (Running on oeis4.)