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A202061 Number of ascent sequences avoiding the pattern 120. 5
1, 1, 2, 5, 14, 42, 133, 442, 1535, 5546, 20754, 80113, 317875, 1292648, 5374073 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

It appears that no formula or g.f. is known.

LINKS

Table of n, a(n) for n=0..14.

P. Duncan and Einar Steingrimsson, Pattern avoidance in ascent sequences, arXiv preprint arXiv:1109.3641, 2011

CROSSREFS

Total number of ascent sequences is given by A022493. Number of ascent sequences avoiding 001 (and others) is A000079; 102 is A007051; 101 is A000108; 000 is A202058; 100 is A202059; 110 is A202060; 120 is A202061; 201 is A202062; 210 is A108304; 0123 is A080937; 0021 is A007317.

Sequence in context: A126569 A162748 A061815 * A129086 A035052 A148330

Adjacent sequences:  A202058 A202059 A202060 * A202062 A202063 A202064

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Dec 10 2011

STATUS

approved

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Last modified February 16 12:48 EST 2019. Contains 320163 sequences. (Running on oeis4.)