login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A276033 Number of generalizations of the partition 1^n with all elements taken modulo 2. 1
1, 2, 3, 6, 8, 17, 22, 50, 64, 154, 196, 493, 625, 1626, 2055, 5487, 6917, 18851, 23713, 65703, 82499, 231725, 290511, 825399, 1033411, 2964951, 3707851, 10728256, 13402696, 39065521, 48760366, 143047486, 178405156, 526399066, 656043856, 1945668346, 2423307046 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Consider the ranked poset L(n) of partitions defined in A002846, and take the elements of each node modulo 2, collapsing two equivalent nodes into 1. Then a(n) is the total number of paths of all lengths 0,1,...,n-1 that start at any node in the poset and end at 1^n.

Odd-indexed terms are the partial sums of Catalan numbers: A014138.  Even-indexed terms a_{2n} are C_n (the n-th Catalan number) less than the following odd-indexed term.

Originally this entry had a reference to a paper on the arXiv by Caleb Ji, Enumerative Properties of Posets Corresponding to a Certain Class of No Strategy Games, arXiv:1608.06025 [math.CO], 2016. However, this article has since been removed from the arXiv. - N. J. A. Sloane, Sep 07 2018

LINKS

Table of n, a(n) for n=1..37.

CROSSREFS

Cf. A276032, A014138.

Sequence in context: A324737 A057574 A198296 * A327018 A329128 A330442

Adjacent sequences:  A276030 A276031 A276032 * A276034 A276035 A276036

KEYWORD

nonn

AUTHOR

Caleb Ji, Aug 17 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 26 13:59 EDT 2022. Contains 354092 sequences. (Running on oeis4.)