VOOZH about

URL: https://oeis.org/history?seq=A351616

⇱ The On-Line Encyclopedia of Integer Sequences (OEIS)

login

Showing entries 1-10 | older changes
Number of free polyominoes with 2n squares, having 180-degree rotational symmetry about a vertex of a square, and no other symmetry.
#32 by Michel Marcus at Sun Dec 21 09:36:38 EST 2025
STATUS
#31 by Joerg Arndt at Sun Dec 21 09:29:37 EST 2025
STATUS
#30 by John Mason at Thu Dec 18 13:28:44 EST 2025
STATUS
#29 by John Mason at Thu Dec 18 13:28:01 EST 2025
FORMULA
STATUS
Discussion
Thu Dec 18
13:28
John Mason: Thanks for the suggestion.
#28 by John Mason at Thu Dec 18 03:35:44 EST 2025
STATUS
Discussion
Thu Dec 18
04:09
John Mason: Though I would have prefered something more compact. I will accept any suggestions.
12:48
Andrei Zabolotskii: I sometimes write "where the terms with non-integer indices are set to 0"
#27 by John Mason at Thu Dec 18 03:34:50 EST 2025
FORMULA
Discussion
Thu Dec 18
03:35
John Mason: Rewrote formula
#26 by Joerg Arndt at Thu Dec 18 01:32:36 EST 2025
STATUS
#25 by Jason Yuen at Wed Dec 17 19:21:09 EST 2025
STATUS
#24 by Jason Yuen at Wed Dec 17 19:21:02 EST 2025
KEYWORD
STATUS
Discussion
Wed Dec 17
19:21
Jason Yuen: What is Axxxxxx?
#23 by John Mason at Wed Dec 17 17:10:25 EST 2025
STATUS