login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A238041 Number of (n+1)X(3+1) 0..2 arrays with the upper median minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
1440, 10812, 81524, 621780, 4837484, 36440340, 282305082, 2134998732, 16538701324, 124970610892, 968345824398, 7317821287212, 56696867316476, 428465558610908, 3319739506259962, 25087428509423164, 194376018181118344 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A238046

LINKS

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

FORMULA

Empirical: a(n) = 35*a(n-2) +1365*a(n-4) +5818*a(n-6) -253745*a(n-8) -2515364*a(n-10) +10622583*a(n-12) +185736185*a(n-14) +215793766*a(n-16) -2565871459*a(n-18) +1332702148*a(n-20) +36260764417*a(n-22) -76174294334*a(n-24) -318514722516*a(n-26) +853854046952*a(n-28) +424255350704*a(n-30) -1871720624096*a(n-32) -110445159552*a(n-34) +754983001216*a(n-36) -22781154048*a(n-38) -449740093440*a(n-40) +150005694464*a(n-42) +20312506368*a(n-44) +3601989632*a(n-46) +1937768448*a(n-48) +134217728*a(n-50)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A078095 A157508 A061221 * A187291 A187193 A223108

Adjacent sequences:  A238038 A238039 A238040 * A238042 A238043 A238044

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 17 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 17 19:10 EDT 2019. Contains 324198 sequences. (Running on oeis4.)