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A236501 Number of (n+1)X(1+1) 0..3 arrays colored with the maximum plus the minimum minus the lower median of every 2X2 subblock 1
256, 2632, 27458, 284408, 2954930, 30642966, 318132117, 3300684904, 34257479784, 355481488428, 3689189768448, 38283796526416, 397297768359304, 4122943466702820, 42786260152594116, 444015373043625472 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236505

LINKS

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

FORMULA

Empirical: a(n) = 308*a(n-3) +4012*a(n-4) +21992*a(n-5) +160712*a(n-6) +584652*a(n-7) +2312740*a(n-8) +6348544*a(n-9) +5341120*a(n-10) +3533664*a(n-11) -174342864*a(n-12) -458662976*a(n-13) -1214806208*a(n-14) -2349785088*a(n-15) +3981769152*a(n-16) +10164177792*a(n-17) +47276054208*a(n-18) +85298810880*a(n-19) -33867762176*a(n-20) -93314875904*a(n-21) -795814825216*a(n-22) -1288724156416*a(n-23) +207101892608*a(n-24) +543866948608*a(n-25) +6245665710080*a(n-26) +9033804898304*a(n-27) -3139783680000*a(n-28) -4668497395712*a(n-29) -17866459840512*a(n-30) -22658241527808*a(n-31) +17119004590080*a(n-32) +17563014660096*a(n-33) -3022314799104*a(n-34)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A236624 A236620 A236505 * A235752 A235815 A235749

Adjacent sequences:  A236498 A236499 A236500 * A236502 A236503 A236504

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2014

STATUS

approved

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Last modified October 28 04:43 EDT 2021. Contains 348313 sequences. (Running on oeis4.)