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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A172758 Number of 2*n X 6 0..3 arrays with row sums 3 and column sums n 1
20, 16260, 20933840, 33833709700, 62810128195920, 127676780106968400, 276686670102097569600, 628807365128705353776900, 1482500191777802616831698000, 3598791496054686645936395190160 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n=1..49

CROSSREFS

Sequence in context: A201507 A167060 A172661 * A146497 A348144 A060618

Adjacent sequences:  A172755 A172756 A172757 * A172759 A172760 A172761

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2010

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 5 03:59 EST 2021. Contains 349530 sequences. (Running on oeis4.)