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 A155314 Number of ways to place zero or more nonadjacent 2,1 2,2 3,0 3,1 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
 1, 7, 19, 37, 88, 640, 5031, 26752, 151436, 1596386, 24274062, 343210818, 4865294909, 96524596845, 2686621268327, 85799102830215 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,2 COMMENTS Same series for 1,1 2,0 2,1 2,2 3,1 3,2 4,3 polyhexes. LINKS Table of n, a(n) for n=4..19. EXAMPLE Maximal 13 X 13 X 13 example ...............0 ..............1.0 .............1.0.1 ............0.1.1.0 ...........0.1.0.0.0 ..........0.0.0.0.0.1 .........0.0.0.0.1.0.1 ........0.1.1.0.0.1.1.0 .......0.0.0.1.1.0.0.1.0 ......0.0.1.1.0.0.1.0.0.1 .....1.1.0.0.0.1.1.0.1.0.1 ....0.0.1.1.0.1.0.1.0.1.1.0 ...0.1.1.0.0.0.0.1.0.0.0.1.0 CROSSREFS Sequence in context: A237052 A155381 A155393 * A155321 A155425 A155410 Adjacent sequences: A155311 A155312 A155313 * A155315 A155316 A155317 KEYWORD nonn AUTHOR R. H. Hardin Jan 22 2009 STATUS approved

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Last modified September 19 17:13 EDT 2024. Contains 376014 sequences. (Running on oeis4.)