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A235958 Number of (n+1)X(4+1) 0..1 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise 1
398, 3574, 27296, 195428, 1340034, 8974124, 59037352, 383935642, 2474858156, 15855538026, 101109317650, 642624413888, 4074162919236, 25782920579854, 162943987863504, 1028761286891880, 6490399113397390, 40925436725829316 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A235962

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) -12*a(n-2) -630*a(n-3) +2185*a(n-4) +11081*a(n-5) -61187*a(n-6) -84848*a(n-7) +866058*a(n-8) -9451*a(n-9) -7440523*a(n-10) +5961993*a(n-11) +41377284*a(n-12) -57568138*a(n-13) -151118526*a(n-14) +300002541*a(n-15) +350238262*a(n-16) -1000944598*a(n-17) -437426084*a(n-18) +2240808356*a(n-19) -633296*a(n-20) -3391604096*a(n-21) +992970752*a(n-22) +3413976256*a(n-23) -1734009344*a(n-24) -2192656896*a(n-25) +1503995904*a(n-26) +829825024*a(n-27) -716570624*a(n-28) -158203904*a(n-29) +174587904*a(n-30) +10485760*a(n-31) -16777216*a(n-32)

EXAMPLE

Some solutions for n=4

..0..1..1..1..1....0..1..1..1..1....0..0..0..1..0....0..1..1..1..1

..1..0..0..0..0....0..0..0..0..0....0..0..0..1..0....1..1..1..1..1

..1..1..0..1..1....0..1..0..1..0....0..0..0..0..1....1..0..1..0..1

..0..1..1..1..1....0..0..0..0..0....0..1..0..0..1....1..1..1..1..1

..0..0..1..0..1....1..0..0..1..0....0..0..0..0..1....0..1..0..1..0

CROSSREFS

Sequence in context: A191942 A158316 A236713 * A187515 A235569 A261768

Adjacent sequences:  A235955 A235956 A235957 * A235959 A235960 A235961

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 17 2014

STATUS

approved

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Last modified September 21 16:31 EDT 2021. Contains 347598 sequences. (Running on oeis4.)