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A089883
Expansion of (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
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
A. Burstein and T. Mansour, Words restricted by 3-letter generalized multipermutation patterns, arXiv:math/0112281 [math.CO], 2001; Annals. Combin., 7 (2003), 1-14.
MATHEMATICA
LinearRecurrence[{8, -22, 23, -6}, {1, 4, 16, 60}, 27] (* Jean-François Alcover, Jan 07 2019 *)
CROSSREFS
Sequence in context: A261519 A262591 A119827 * A089932 A120926 A255303
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jan 18 2004
STATUS
approved