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A304050
Coordination sequence for one of the inner vertices introduced in the first inflation-deflation step in a Half-Hex tiling.
4
1, 6, 18, 30, 36, 48, 72, 78, 78, 96, 120, 138, 126, 132, 174, 180, 168, 186, 222, 240, 216, 222, 288, 282, 246, 276, 324, 348, 306, 306, 384, 384, 342, 366, 426, 450, 396, 396, 498, 486, 420, 456, 528, 570, 486, 468, 594, 588, 516, 546, 630, 660, 576, 570
OFFSET
0,2
COMMENTS
The first inflation-deflation step leads to the following configuration (where O marks the reference vertex for this sequence; this vertex is hexavalent from the second inflation-deflation step onwards):
+-------------+
/ \ / \
/ \ / \
/ O-------+ \
/ / \ \
/ / \ \
+-----+-------------+-----+
After k > 1 inflation-deflation steps, we can compute a finite coordination sequence c_k (until we reach the edge of the tiling after k steps). It appears that for i and j such that 1 < i < j, c_i is a prefix of c_j; this sequence is the limiting sequence of the { c_i, i > 1 } family.
See A304076 and A304077 for similar sequences.
PROG
(C++) See Links section.
CROSSREFS
Cf. A304075 (partial sums), A304076, A304077.
Sequence in context: A225110 A077660 A240991 * A376028 A351220 A242394
KEYWORD
nonn
AUTHOR
Rémy Sigrist, May 05 2018
STATUS
approved