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Search: id:A153918
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A153918 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 5 X 5 X 5 subtriangle. +0
1
1, 2, 3, 6, 8, 13, 27, 79, 206, 623, 1643, 6478, 21771, 102958, 407720, 2191304, 10858499, 72602092, 437224300, 3520328145, 25109099300, 244666233084, 2097356566526, 24692650522065, 255493996817129, 3611171350858856 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A024788 A004101 A003405 this_sequence A114319 A089426 A066739

Adjacent sequences: A153915 A153916 A153917 this_sequence A153919 A153920 A153921

KEYWORD

nonn

AUTHOR

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

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Last modified December 17 19:39 EST 2009. Contains 170821 sequences.

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