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A237334 Number of (n+1)X(2+1) 0..3 arrays with the maximum minus the minimum of every 2X2 subblock equal 1
1980, 41220, 821234, 17627820, 380945760, 8406402902, 187274820848, 4212082221444, 95349805566302, 2169810608997912, 49567582138584820, 1135678343874996398, 26077450896771261320, 599775893998365758200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A237340

LINKS

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

FORMULA

Empirical: a(n) = 47*a(n-1) -506*a(n-2) -5350*a(n-3) +119418*a(n-4) -292491*a(n-5) -5769290*a(n-6) +38319506*a(n-7) +16591825*a(n-8) -782193687*a(n-9) +1731908806*a(n-10) +3853403204*a(n-11) -18163240306*a(n-12) +6781065371*a(n-13) +52909631318*a(n-14) -59067161032*a(n-15) -56301011344*a(n-16) +103756990512*a(n-17) +14034541408*a(n-18) -73613340160*a(n-19) +8403519488*a(n-20) +22531661824*a(n-21) -3926882304*a(n-22) -2687410176*a(n-23) +403046400*a(n-24) +86507520*a(n-25)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A225235 A289907 A125490 * A035870 A345517 A345770

Adjacent sequences:  A237331 A237332 A237333 * A237335 A237336 A237337

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 06 2014

STATUS

approved

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Last modified September 22 13:48 EDT 2021. Contains 347607 sequences. (Running on oeis4.)