OFFSET
0,3
COMMENTS
It appears that no formula or g.f. is known.
LINKS
Andrew Conway and Miles Conway, Table of n, a(n) for n = 0..628
Andrew R. Conway, Miles Conway, Andrew Elvey Price and Anthony J. Guttmann, Pattern-avoiding ascent sequences of length 3, arXiv:2111.01279 [math.CO], Nov 01 2021.
P. Duncan and Einar Steingrimsson, Pattern avoidance in ascent sequences, arXiv preprint arXiv:1109.3641, 2011
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 10 2011
EXTENSIONS
Corrected a(7), was 383, but should be 583 according to Duncan-Steimgrimsson paper and independent computation. - Andrew Baxter, Jan 06 2014
a(0) and a(15)-a(21) from Alois P. Heinz, Jan 06 2014
a(22) from Alois P. Heinz, Oct 06 2014
a(23) from Alois P. Heinz, Apr 20 2016
More terms from Anthony Guttmann, Nov 04 2021
STATUS
approved