A124802 Triangle, row sums = Fibonacci numbers in two ways, companion to A124801.

1, 1, 1, 1, 3, -1, 1, 6, -4, 2, 1, 10, -10, 10, -3, 1, 15, -20, 30, -18, 5, 1, 21, -35, 70, -63, 35, -8, 1, 28, -56, 140, -168, 140, -64, 13

Offset

2,5

Comments

Row sums (signed) = Fn; row sums unsigned = F(2n-3).

Links

Table of n, a(n) for n=2..37.

Formula

Delete the "zero" column of A124801.

Example

First few rows of the triangle are:
1;
1, 1;
1, 3, -1;
1, 6, -4, 2;
1, 10, -10, 10, -3;
1, 15, -20, 30, -18, 5;
1, 21, -35, 70, -63, 35, -8;
1, 28, -56, 140, -168, 140, -64, 13;
Example: row 7 signed = F7 = 13 = (1 + 15 - 20 + 30 - 18 + 5).
Row 7 unsigned = F(2n+3) = F11 = (1 + 15 + 20 + 30 + 18 + 5)

Crossrefs

Cf. A124801, A039834.

Sequence in context: A355996 A128101 A211351 * A211350 A178867 A335256

Adjacent sequences: A124799 A124800 A124801 * A124803 A124804 A124805

Keyword

tabl,sign

Author

Gary W. Adamson, Nov 08 2006

Status

approved