OFFSET
0,3
COMMENTS
It appears that no formula or g.f. is known.
LINKS
Liang Chengwei, Shi Lecun and Cai Zhongyu, Table of n, a(n) for n = 0..500 (terms 0..74 from Andrew Conway and Miles Conway)
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.
Paul Duncan and Einar Steingrimsson, Pattern avoidance in ascent sequences, arXiv preprint arXiv:1109.3641 [math.CO], 2011.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 10 2011
EXTENSIONS
More terms from Anthony Guttmann, Nov 04 2021
STATUS
approved