A208152 Triangle by rows, generated from the Ruler sequence A001511.

1, 1, 1, 3, 2, 1, 6, 4, 1, 1, 24, 16, 4, 3, 1, 48, 32, 8, 6, 1, 1, 144, 96, 24, 18, 3, 2, 1, 188, 192, 48, 36, 6, 4, 1, 1, 1440, 960, 240, 180, 30, 20, 5, 4, 1, 2880, 1920, 480, 360, 60, 10, 8, 1, 1, 8640, 5760, 1440, 1080, 180, 120, 30, 24, 3, 2, 1

Offset

1,4

Comments

Row sums = A208147: (1, 2, 6, 12, 48, 96, 288, ...).

Links

Table of n, a(n) for n=1..65.

Formula

Inverse of:

1;

-1, 1;

-1, -2, 1;

-1, -2, -1, 1;

-1, -2, -1, -3, 1;

-1, -2, -1, -3, -1, 1;

-1, -2, -1, -3, -1, -2, 1;

..., where the signed terms are negatives of A001511 terms: (1, 2, 1, 3, 1, 2, 1, 4, ...).

Example

First few rows of the triangle =
     1;
     1,    1;
     3,    2,    1;
     6,    4,    1,    1;
    24,   16,    4,    3,   1;
    48,   32,    8,    6,   1,   1;
   144,   96,   24,   18,   3,   2,  1;
   288,  192,   48,   36,   6,   4,  1,  1;
  1440,  960,  240,  180,  30,  20,  5,  4, 1;
  2880, 1920,  480,  360,  60,  40, 10,  8, 1, 1;
  8640, 5760, 1440, 1080, 180, 120, 30, 24, 3, 2, 1;
  ...

Crossrefs

Cf. A001511, A208147.

Sequence in context: A323417 A102189 A031252 * A194761 A129674 A120771

Adjacent sequences: A208149 A208150 A208151 * A208153 A208154 A208155

Keyword

nonn,tabl

Author

Gary W. Adamson, Feb 23 2012

Status

approved