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Number of (not necessarily connected) line structures or "topoglyphs" with n regions.
1

%I #13 Aug 29 2018 11:12:06

%S 1,1,5,28,220

%N Number of (not necessarily connected) line structures or "topoglyphs" with n regions.

%C The precise definition is hard to understand from the article. But Marcel Golay was a famous scientist, and this article seems to have been overlooked, so the sequences are worth placing on record.

%D Marcel J. E. Golay, Topoglyphs, IEEE Trans. Computers, C-27 (No. 2, Feb. 1978), 164-167.

%H N. J. A. Sloane, <a href="/A317967/a317967_1.pdf">Annotated scan of the Golay article</a>

%Y Cf. A317967.

%Y A250001 is a similar sequence.

%K nonn,more

%O 0,3

%A _N. J. A. Sloane_, Aug 27 2018