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A089883 G.f.: (1-4*x+6*x^2-3*x^3)/((1-3*x)*(1-2*x)*(1-3*x+x^2)). 2
1, 4, 16, 60, 214, 736, 2464, 8082, 26092, 83188, 262582, 822144, 2557120, 7910050, 24357580, 74720436, 228485158, 696795712, 2120116768, 6438264498, 19518937516, 59091592564, 178675498006, 539694923520, 1628691435904, 4911230068546, 14799559211404 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

I did not study this paper carefully, but it appears that this g.f. might be wrong and the correct version should be that in A089932.

LINKS

Table of n, a(n) for n=0..26.

A. Burstein and T. Mansour, Words restricted by 3-letter generalized multipermutation patterns, Annals. Combin., 7 (2003), 1-14.

Index entries for linear recurrences with constant coefficients, signature (8,-22,23,-6).

CROSSREFS

Sequence in context: A261519 A262591 A119827 * A089932 A120926 A255303

Adjacent sequences:  A089880 A089881 A089882 * A089884 A089885 A089886

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jan 18 2004

STATUS

approved

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Last modified August 16 19:22 EDT 2017. Contains 290626 sequences.