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

7, 12, 23, 42, 78, 142, 262, 482, 887, 1630, 2999, 5516, 10146, 18660, 34322, 63128, 116111

Offset: 4

Author

N. J. A. Sloane, Sep 05 2004

Keywords

• nonn

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.

Crossrefs

Cf. A006355, A097926.

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