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A097925 Number of (n,3) Freiman-Wyner sequences. 2

%I

%S 7,12,23,42,78,142,262,482,887,1630,2999,5516,10146,18660,34322,63128,

%T 116111

%N Number of (n,3) Freiman-Wyner sequences.

%C "The values for n <= 3 are straightforward."

%D I. F. Blake, The enumeration of certain run length sequences, Information and Control, 55 (1982), 222-237.

%F Appears to satisfy a linear recurrence with characteristic polynomial (1+x)(1+x^2)(1-x-x^2-x^3). - _Ralf Stephan_, Dec 04 2004

%Y Cf. A006355, A097926.

%K nonn

%O 4,1

%A _N. J. A. Sloane_, Sep 05 2004

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Last modified September 26 04:31 EDT 2020. Contains 337346 sequences. (Running on oeis4.)