OFFSET
0,13
COMMENTS
This sequence can be derived from A008326 by Euler transform. - Andrew Howroyd, Apr 03 2020
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..189
B. D. McKay and E. Rogoyski, Latin squares of order ten, Electron. J. Combinatorics, 2 (1995) #N3.
FORMULA
Column k is the Euler transform of column k of A008326. - Andrew Howroyd, Apr 03 2020
EXAMPLE
Triangle begins:
1,
1, 1,
1, 1, 1,
1, 1, 1, 1,
1, 1, 2, 1, 1,
1, 1, 2, 2, 1, 1,
1, 1, 4, 6, 4, 1, 1;
1, 1, 4, 14, 14, 4, 1, 1;
1, 1, 7, 41, 130, 41, 7, 1, 1;
1, 1, 8, 157, 1981, 1981, 157, 8, 1, 1;
...
CROSSREFS
KEYWORD
AUTHOR
EXTENSIONS
More terms from Eric Rogoyski, May 15 1997
Name clarified by Andrew Howroyd, Sep 05 2018
STATUS
approved