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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A212927 Number of nX5 0..4 arrays with no column j greater than column j-1 in all rows 1
126, 4431876, 23124921876, 85800824609376, 285912852294921876, 916111390974365234376, 2891333179750701904296876, 9071116924325493011474609376, 28391912978833403911590576171876 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A212930

LINKS

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

FORMULA

Empirical: a(n) = 5251*a(n-1) -7960875*a(n-2) +4411393125*a(n-3) -945536250000*a(n-4) +70667695312500*a(n-5) -1290429687500000*a(n-6) +1220703125000000*a(n-7).

Empirical: a(n) = -2*100^n-2*25^n-4*1250^n+3*500^n+3*250^n+3125^n+1. R. J. Mathar, Jun 27 2012

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A078206 A025037 A281478 * A300785 A051335 A186995

Adjacent sequences:  A212924 A212925 A212926 * A212928 A212929 A212930

KEYWORD

nonn

AUTHOR

R. H. Hardin May 31 2012

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 December 6 21:48 EST 2019. Contains 329809 sequences. (Running on oeis4.)