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A154075 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 9. 0
1650, 6592, 10881, 16801, 14513, 14220, 11083, 6900, 3475, 1606, 588, 460, 253, 244, 241, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

COMMENTS

Pattern 240 300 240 240 240 starts at n=20 and continues through at least n=53.

LINKS

Table of n, a(n) for n=5..53.

CROSSREFS

Sequence in context: A253030 A252684 A203864 * A251897 A251905 A251898

Adjacent sequences:  A154072 A154073 A154074 * A154076 A154077 A154078

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified October 18 20:20 EDT 2021. Contains 348070 sequences. (Running on oeis4.)