login
A143802
Triangle read by rows, "n" followed by (n-1) terms of (1, 3, 7, 15, ...).
0
1, 2, 1, 3, 1, 3, 4, 1, 3, 7, 5, 1, 3, 7, 15, 6, 1, 3, 7, 15, 31, 7, 1, 3, 7, 15, 31, 63, 8, 1, 3, 7, 15, 31, 63, 127, 9, 1, 3, 7, 15, 31, 63, 127, 255, 10, 1, 3, 7, 15, 31, 63, 127, 255, 511
OFFSET
1,2
COMMENTS
Sum of terms in n-th row = rightmost term in next row.
EXAMPLE
First few rows of the triangle:
1;
2, 1;
3, 1, 3;
4, 1, 3, 7;
5, 1, 3, 7, 15;
6, 1, 3, 7, 15, 31;
7, 1, 3, 7, 15, 31, 63;
...
CROSSREFS
Cf. A000225 (row sums).
Sequence in context: A050123 A081386 A213712 * A177040 A336887 A163313
KEYWORD
nonn,tabl,easy
AUTHOR
Gary W. Adamson, Sep 01 2008
STATUS
approved