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!)
A166217 Number of 9X9X9 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n 2
1, 34, 665, 8865, 76249, 495985, 2661967, 11908924, 46316901, 161588843, 510043341, 1480441810, 4011008946, 10193915255, 24508598458, 56179164262, 123191992504, 259647495716, 528503830704, 1041183396446, 1991316075404 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, Table of n, a(n) for n=0..26

CROSSREFS

Sequence in context: A322501 A020928 A061689 * A188711 A296334 A296634

Adjacent sequences:  A166214 A166215 A166216 * A166218 A166219 A166220

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 09 2009

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 July 8 17:40 EDT 2020. Contains 335524 sequences. (Running on oeis4.)