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A236945 Number of (n+1)X(4+1) 0..3 arrays with the maximum of every 2X2 subblock equal 1
357316, 178006252, 73196854050, 33887916009662, 14993765290435528, 6794451721009466204, 3048340953731729204888, 1374356722643878889083728, 618307293958885883485092842, 278452157946874640429634543018 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A236949

LINKS

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

FORMULA

Empirical: a(n) = 424*a(n-1) +62841*a(n-2) -23821786*a(n-3) -323958504*a(n-4) +344301777418*a(n-5) -9832213915612*a(n-6) -1327040412239104*a(n-7) +52919393633676596*a(n-8) +1661194003472702658*a(n-9) -81478174052335909816*a(n-10) -414773977421061937634*a(n-11) +43172424299930717855749*a(n-12) -257155013696867677011256*a(n-13) -4323650605031746975388613*a(n-14) +25177679306370855714028416*a(n-15) +180403547575480950604999824*a(n-16) -429577562160330756023400192*a(n-17) -1243975490088381892935023616*a(n-18) +3997026635500888039521681408*a(n-19) -2980738212000703127936040960*a(n-20) -103313284358758051809853440*a(n-21) +559534813959237271761715200*a(n-22)

EXAMPLE

Some solutions for n=1

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

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

CROSSREFS

Sequence in context: A203876 A233752 A238382 * A237486 A258952 A251456

Adjacent sequences:  A236942 A236943 A236944 * A236946 A236947 A236948

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 01 2014

STATUS

approved

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Last modified September 17 22:42 EDT 2021. Contains 347489 sequences. (Running on oeis4.)