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A097925 Number of (n,3) Freiman-Wyner sequences. 2
7, 12, 23, 42, 78, 142, 262, 482, 887, 1630, 2999, 5516, 10146, 18660, 34322, 63128, 116111 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

COMMENTS

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

REFERENCES

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

LINKS

Table of n, a(n) for n=4..20.

FORMULA

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

CROSSREFS

Cf. A006355, A097926.

Sequence in context: A160423 A252652 A192752 * A132195 A076852 A011996

Adjacent sequences:  A097922 A097923 A097924 * A097926 A097927 A097928

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 05 2004

STATUS

approved

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Last modified August 10 16:56 EDT 2020. Contains 336381 sequences. (Running on oeis4.)