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A151538 Number of 1-sided strip polyedges with n cells. 4
1, 2, 6, 14, 40, 102, 284, 752, 2069, 5547, 15134, 40712, 110456, 297066, 802808, 2156378, 5810329, 15584271, 41894990, 112217372, 301115391, 805584175, 2158366236, 5768337730, 15435275815, 41214200699, 110164972820, 293922598172, 784925297952, 2092745480990, 5584229143243 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
With A001411 as main input and counting the symmetrical shapes separately, higher terms can be computed efficiently (see formula). - Bert Dobbelaere, Jan 07 2019
LINKS
Eric Weisstein's World of Mathematics, Polyedge
FORMULA
a(n) = (A001411(n) + A323189(n)) / 8. - Bert Dobbelaere, Jan 07 2019
CROSSREFS
Sequence in context: A299119 A348010 A271895 * A284998 A009423 A008325
KEYWORD
nonn,hard
AUTHOR
Ed Pegg Jr, May 13 2009
EXTENSIONS
a(13)-a(19) from Joseph Myers, Oct 03 2011
More terms using formula by Bert Dobbelaere, Jan 07 2019
STATUS
approved

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Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)