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A158948
Triangle read by rows, left border = natural numbers repeated (1, 1, 2, 2, 3, 3, ...); all other columns = (1, 0, 1, 0, 1, 0, ...).
2
1, 1, 1, 2, 0, 1, 2, 1, 0, 1, 3, 0, 1, 0, 1, 3, 1, 0, 1, 0, 1, 4, 0, 1, 0, 1, 0, 1, 4, 1, 0, 1, 0, 1, 0, 1, 5, 0, 1, 0, 1, 0, 1, 0, 1, 5, 1, 0, 1, 0, 1, 0, 1, 0, 1
OFFSET
1,4
COMMENTS
Row sums = n. Eigensequence of the triangle = nonzero terms of A000071: (1, 2, 4, 7, 12, 20, ...) = ((F3 - 1), (F4 - 1), (F5 - 1), ...).
FORMULA
Triangle by rows, left border = natural numbers repeated (1, 1, 2, 2, 3, 3, ...); all other columns = (1, 0, 1, 0, 1, 0, ...).
EXAMPLE
First few rows of the triangle:
1;
1, 1;
2, 0, 1;
2, 1, 0, 1;
3, 0, 1, 0, 1;
3, 1, 0, 1, 0, 1;
4, 0, 1, 0, 1, 0, 1;
4, 1, 0, 1, 0, 1, 0, 1;
5, 0, 1, 0, 1, 0, 1, 0, 1;
5, 1, 0, 1, 0, 1, 0, 1, 0, 1;
6, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
6, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
7, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
...
CROSSREFS
Cf. A000071.
Sequence in context: A293386 A322522 A168121 * A140224 A075993 A117170
KEYWORD
nonn,tabf
AUTHOR
Gary W. Adamson, Mar 31 2009
STATUS
approved