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

1,1

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).

Links

Table of n, a(n) for n=1..56.

Example

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

Crossrefs

Sequence in context: A120072 A166492 A120070 * A121164 A086872 A363421

Adjacent sequences: A143750 A143751 A143752 * A143754 A143755 A143756

Keyword

nonn,easy,tabf

Author

Paul Curtz, Aug 31 2008

Status

approved