login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A203051 Number of nX2 0..5 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor 1
6, 286, 7820, 177290, 4078368, 96511488, 2282090278, 53729637298, 1264907516536, 29797761325536, 701982503271882, 16535890993275488, 389515214599154626, 9175447823797074126, 216137962147112553480, 5091361932881161899850 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A203057

LINKS

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

FORMULA

Empirical: a(n) = 21*a(n-1) -50*a(n-2) +2261*a(n-3) +5179*a(n-4) +58301*a(n-5) +113102*a(n-6) +454821*a(n-7) +550157*a(n-8) +1071256*a(n-9) +600336*a(n-10) +518400*a(n-11)

EXAMPLE

Some solutions for n=5

..1..2....2..4....1..1....5..1....0..2....4..5....0..5....5..0....0..3....2..1

..3..5....2..4....1..5....5..2....2..3....5..5....0..5....5..5....1..5....2..1

..3..5....3..0....0..5....2..1....4..3....2..2....1..0....2..1....2..5....0..2

..2..5....3..3....5..3....0..5....4..2....3..0....4..5....1..4....4..0....0..3

..0..2....1..0....5..1....1..5....3..2....4..4....3..5....4..4....5..5....2..3

CROSSREFS

Sequence in context: A049679 A201139 A172660 * A128792 A027875 A203422

Adjacent sequences:  A203048 A203049 A203050 * A203052 A203053 A203054

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 28 2011

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 August 12 09:05 EDT 2020. Contains 336438 sequences. (Running on oeis4.)