OFFSET
0,3
EXAMPLE
a(3) = 163:
1 2 3
2 5 4
3 4 6
a(4) = 9850:
1 2 3 4
2 8 5 6
3 5 9 7
4 6 7 10
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Stefano Spezia, Feb 14 2022
EXTENSIONS
a(5)-a(6) from Hugo Pfoertner, Feb 15 2022
STATUS
approved