OFFSET
1,4
COMMENTS
If row(n) has, seen as a set, only one element k then k is either 1 or 1 + 2^n and n has the form 2^n or 3*2^n.
EXAMPLE
1
1, 1
2, 2, 2
1, 1, 1, 1
4, 2, 4, 2, 4
3, 3, 3, 3, 3, 3
2, 4, 2, 4, 2, 4, 2
1, 1, 1, 1, 1, 1, 1, 1
8, 2, 4, 2, 8, 2, 4, 2, 8
7, 7, 3, 3, 7, 7, 3, 3, 7, 7
6, 8, 6, 4, 6, 8, 6, 4, 6, 8, 6
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Peter Luschny, Sep 22 2019
STATUS
approved