A196993 - OEIS

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A196993

Number of fixed polypons with n cells (division into triangles is significant).

6, 9, 14, 24, 42, 77, 144, 276, 538, 1065, 2136, 4321, 8790, 17967, 36890, 76050, 157380, 326824, 680880, 1422570, 2979572, 6254175, 13153242, 27712901, 58487796, 123632910

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..26.

Eric Weisstein's World of Mathematics, Polypon

CROSSREFS

Cf. A057784, A151531, A151532, A151533.

Sequence in context: A316020 A300573 A020717 * A303162 A242042 A316021

Adjacent sequences: A196990 A196991 A196992 * A196994 A196995 A196996

KEYWORD

nonn,hard

AUTHOR

Joseph Myers, Oct 08 2011

STATUS

approved