A143753 Irregular triangle: A120070 read downwards antidiagonals.

3, 8, 5, 15, 12, 24, 7, 21, 35, 16, 32, 48, 9, 27, 45, 63, 20, 40, 60, 80, 11, 33, 55, 77, 99, 24, 48, 72, 96, 120, 13, 39, 65, 91, 117, 143, 28, 56, 84, 112, 140, 168, 15, 45, 75, 105, 135, 165, 195, 32, 64, 96, 128, 160, 192, 224

Offset: 1

Author

Paul Curtz, Aug 31 2008

Keywords

• nonn
• easy
• tabf

Comments

The triangle in this rearrangement contains 1, 1, 2, 2, 3, 3, 4, 4,... = floor((n+1)/2) entries in row n.

The first differences between terms in row n are A005843(n+2).

Examples

			3;
8;
5,15;
12,24;
7,21,35;
16,32,48;