OFFSET
1,5
LINKS
Michael S. Branicky, Table of n, a(n) for n = 1..96
Don Knuth, Baxter matrices, Preprint, Sep 05 2021.
George Spahn, Counting Baxter Matrices, arXiv:2110.09688 [math.CO], 2021.
EXAMPLE
The array begins:
1,1,1,1,1,1,1, ...
1,6,14,24,36,50,66, ...
1,14,69,203,463,903,1585, ...
1,24,203,972,3324,9074,21168, ...
1,36,463,3324,16355,61267,188153, ...
1,50,903,9074,61267,306352,1219598, ...
1,66,1585,21168,188153,1219598,6175181, ...
...
The first few antidiagonals are:
1,
1,1,
1,6,1,
1,14,14,1,
1,24,69,24,1,
1,36,203,203,36,1,
1,50,463,972,463,50,1,
1,66,903,3324,3324,903,66,1,
1,84,1585,9074,16355,9074,1585,84,1,
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Sep 10 2021
EXTENSIONS
a(25) corrected by and a(46)-a(66) from Michael S. Branicky, Sep 14 2021
STATUS
approved