The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A153913

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Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 2 ones in any 3 X 3 X 3 subtriangle.
(history; published version)

#5 by Jon E. Schoenfield at Wed Apr 28 00:15:37 EDT 2021

STATUS

editing

approved

#4 by Jon E. Schoenfield at Wed Apr 28 00:15:36 EDT 2021

AUTHOR

R. H. Hardin , Jan 03 2009

STATUS

approved

editing

#3 by Russ Cox at Sat Mar 31 12:35:21 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Jan 03 2009

Discussion

Sat Mar 31

12:35

OEIS Server: https://oeis.org/edit/global/875

#2 by N. J. A. Sloane at Sat Oct 02 03:00:00 EDT 2010

KEYWORD

nonn,new

nonn

AUTHOR

Ron R. H. Hardin (rhhardin(AT)att.net) Jan 03 2009

#1 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

NAME

Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 2 ones in any 3 X 3 X 3 subtriangle.

DATA

1, 2, 26, 129, 122, 239, 1864, 1591, 5085, 36162, 47771, 138927, 1581118, 1910444, 8834202, 91938135, 174908406, 743306687, 12298725970, 21309347213, 143524473375, 2166989721589, 5956644162405, 36651705702510

OFFSET

0,2

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 03 2009

STATUS

approved