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!)
A067015 Triangle T(n,k) (n>=1, rows have irregular lengths) giving number of arrangements of k nonattacking princes on an n X n staggered hexagonal torus board. 1
1, 1, 4, 1, 9, 9, 3, 1, 16, 72, 96, 32, 1, 25, 225, 910, 1695, 1355, 440, 70, 5, 1, 36, 522, 3936, 16659, 39996, 52860, 36108, 11871, 1960, 270, 36, 3, 1, 49, 1029, 12166, 89551, 429058, 1361619, 2864113, 3946208, 3481835, 1904833, 621026, 116060, 12285, 693, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

A partition function for the staggered grid torus.

LINKS

Table of n, a(n) for n=0..49.

EXAMPLE

1; 1,4; 1,9,9,3; 1,16,72,96,32; 1,25,225,910,1695,1355,440,70,5; ...

CROSSREFS

Row sums give A066865.

Sequence in context: A021990 A182545 A084887 * A158199 A091885 A069606

Adjacent sequences:  A067012 A067013 A067014 * A067016 A067017 A067018

KEYWORD

tabf,nonn

AUTHOR

R. H. Hardin, Feb 17 2002

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 1 09:27 EDT 2020. Contains 334759 sequences. (Running on oeis4.)