The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A356111

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A356111

The number of 1+1+1-free ordered posets of [n].
(history; published version)

#19 by Michael De Vlieger at Sat Oct 05 09:41:02 EDT 2024

STATUS

reviewed

approved

#18 by Joerg Arndt at Sat Oct 05 02:04:48 EDT 2024

STATUS

proposed

reviewed

#17 by Andrew Howroyd at Fri Oct 04 14:41:08 EDT 2024

STATUS

editing

proposed

#16 by Andrew Howroyd at Fri Oct 04 14:41:01 EDT 2024

CROSSREFS

Cf. A001181.

STATUS

proposed

editing

#15 by Andrew Howroyd at Fri Oct 04 14:40:08 EDT 2024

STATUS

editing

proposed

#14 by Andrew Howroyd at Fri Oct 04 14:38:40 EDT 2024

FORMULA

GConjectured g.f.: 2 - 2*x/(B(x)-1+x), where B(x) is the Oo.Gg.Ff. for A001181 (Baxter permutations) (conjectured)._ - _Michael D. Weiner_, Oct 04 2024

STATUS

proposed

editing

#13 by Michael D. Weiner at Fri Oct 04 14:35:56 EDT 2024

STATUS

editing

proposed

#12 by Michael D. Weiner at Fri Oct 04 14:35:47 EDT 2024

FORMULA

G.f.: 2-2*x/(B(x)-1+x), where B(x) is the O.G.F. for A001181 (Baxter permutations) (conjectured).Michael D. Weiner, Oct 04 2024

STATUS

approved

editing

#11 by Peter Luschny at Sun Aug 21 11:32:11 EDT 2022

STATUS

reviewed

approved

#10 by Joerg Arndt at Sun Aug 21 10:40:50 EDT 2022

STATUS

proposed

reviewed