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A258004 Capless binary boundary codes for holeless strictly non-overlapping polyhexes, only the maximal representative from each equivalence class obtained by rotating. 4
0, 63, 990, 3822, 15222, 15738, 15804, 60858, 62394, 62940, 224694, 241110, 241338, 243162, 243420, 244188, 249306, 249318, 249564, 249660, 251370, 251628, 251634, 252396, 252660, 252792, 964314, 964326, 965340, 972522, 972636, 973548, 976620, 990678, 995034, 995046, 997098, 997212, 998124, 998130, 1003242, 1005420 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
Indexing starts from zero, because a(0) = 0 is a special case, indicating an empty path, which thus ends at the same vertex as where it started from.
LINKS
FORMULA
a(n) = A053645(A258003(n)).
EXAMPLE
63 ("111111" in binary) is present as it encodes a single hex. This is because when we walk in honeycomb-lattice from vertex to vertex, at each vertex turning to the same direction, we will return to the starting vertex after enclosing a hex with six such steps.
PROG
(Scheme)
(define (A258004 n) (A053645 (A258003 n)))
CROSSREFS
Subsequence of A255561 and A258014.
Sequence in context: A232794 A091027 A112494 * A258014 A183076 A230660
KEYWORD
nonn,base
AUTHOR
Antti Karttunen, May 16 2015
STATUS
approved

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Last modified June 17 23:25 EDT 2024. Contains 373468 sequences. (Running on oeis4.)