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Template:Sequence of the Day for November 22

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Intended for: November 22, 2013

Timetable

  • First draft to be entered by August 22, 2013
  • Draft to be reviewed by September 22, 2013
  • Draft to be approved by October 22, 2013
Yesterday's SOTD * Tomorrow's SOTD

The line below marks the end of the <noinclude> ... </noinclude> section.



A1134567: Sequence title.

{ 11, 22, 2013, 4, 5, 6, 7, ... }

Two or three sentences of info about this sequence.


Thanksgiving 2018 falls on November 22.


A000055: Number of trees with
n, n   ≥   0,
unlabeled nodes.
{ 1, 1, 1, 1, 2, 3, 6, 11, 23, 47, 106, 235, ... }

Trees with
n
unlabeled nodes[1]

n
Trees
0
 
Null tree
1
2
●—●
3
●—●—●
4
             ●
            /
●—●—●—●  ●—●  
            \
             ●
5
                 ●    ●
                /     |
●—●—●—●—●  ●—●—●    ●—●—●  
                \     |
                 ●    ●

This is the sequence for the example search on the front page of the OEIS. This Thanksgiving we are thankful for, among other things, the OEIS, which is an invaluable resource in many mathematical and scientific endeavors.

__________

  1. Weisstein, Eric W., Tree, from MathWorld—A Wolfram Web Resource.



In the United States:

 http://www.calendardate.com/thanksgiving.htm
 http://www.timeanddate.com/holidays/canada/thanksgiving-day

Thanksgiving is observed on the every fourth Thursday of November. The holiday is celebrated in remembrance of the pilgrims and in order to give thanks.

A?????? Thanksgiving (USA) November date
a (n), n   ≥   1980
. (Up to 2020 given below.)
{27, 26, 25, 24, 22, 28, 27, 26, 24, 23, 22, 28, 26, 25, 24, 23, 28, 27, 26, 25, 23, 22, 28, 27, 25, 24, 23, 22, 27, 26, 25, 24, 22, 28, 27, 26, 24, 23, 22, 28, 26, ...}

In Canada:

 http://www.calendardate.com/thanksgiving.htm 
 http://www.timeanddate.com/holidays/canada/thanksgiving-day

The Canadian Thanksgiving is celebrated on the second Monday of the month [of October] (the reason for the earlier date in October is their earlier harvest occurring farther to the north). The Canadian holiday comes from different traditions although it is now meant to convey thanks for their harvest.

A?????? Thanksgiving (Canada) October date
a (n), n   ≥   1980
. (Up to 2015 given below.)
{13, 12, 11, 10, 8, 14, 13, 12, 10, 9, 8, 14, 12, 11, 10, 9, 14, 13, 12, 11, 9, 8, 14, 13, 11, 10, 9, 8, 13, 12, 11, 10, 8, 14, 13, 12, ...}