A143802 Triangle read by rows, "n" followed by (n-1) terms of (1, 3, 7, 15, ...).

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.

Links

Table of n, a(n) for n=1..55.

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

Adjacent sequences: A143799 A143800 A143801 * A143803 A143804 A143805

Keyword

nonn,tabl,easy

Author

Gary W. Adamson, Sep 01 2008

Status

approved