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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
OFFSET
5,1
COMMENTS
Pattern 240 300 240 240 240 starts at n=20 and continues through at least n=53.
CROSSREFS
Sequence in context: A253030 A252684 A203864 * A251897 A251905 A251898
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved