A154079 - OEIS

A154079

Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 4 X 4 X 4 subtriangle summing to 10.

6, 23, 8, 23, 7, 21, 5, 14, 5, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4, 10, 4, 13, 4

(list; graph; refs; listen; history; text; internal format)

OFFSET

4,1

COMMENTS

Pattern 10 4 13 4 starts at n=13 and continues through at least n=60.

LINKS

Table of n, a(n) for n=4..60.

EXAMPLE

Maximal zeros solution for n=13

..............4

.............0.0

............0.2.0

...........0.2.2.0

..........4.0.0.0.4

.........0.0.2.2.0.0

........0.2.0.2.0.2.0

.......0.2.2.0.0.2.2.0

......4.0.0.0.4.0.0.0.4

.....0.0.2.2.0.0.2.2.0.0

....0.2.0.2.0.2.0.2.0.2.0

...0.2.2.0.0.2.2.0.0.2.2.0

..4.0.0.0.4.0.0.0.4.0.0.0.4

CROSSREFS

Sequence in context: A121796 A051224 A062818 * A160633 A012327 A012523

Adjacent sequences: A154076 A154077 A154078 * A154080 A154081 A154082

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved