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!)
A195804 Number of triangular nXnXn 0..7 arrays with all rows and diagonals having the same length having the same sum, with corners zero 0
1, 1, 8, 512, 27412, 21779968, 479534519840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 7 of A195805

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=5

......0..........0..........0..........0..........0..........0..........0

.....1.1........4.0........1.1........2.5........3.0........3.0........6.3

....0.1.2......0.1.2......0.1.2......7.1.2......5.1.6......5.1.6......1.1.2

...2.2.0.0....1.2.0.3....2.2.0.0....2.0.5.4....0.3.2.2....0.3.2.2....3.3.2.5

..0.0.1.2.0..0.3.1.1.0..0.0.1.2.0..0.5.3.3.0..0.3.4.1.0..0.3.4.1.0..0.6.0.4.0

CROSSREFS

Sequence in context: A241756 A236220 A128794 * A145259 A154025 A013713

Adjacent sequences:  A195801 A195802 A195803 * A195805 A195806 A195807

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 23 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 October 23 04:06 EDT 2021. Contains 348211 sequences. (Running on oeis4.)