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A143753 Irregular triangle: A120070 read downwards antidiagonals. 1
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 (list; graph; refs; listen; history; text; internal format)
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 A323760

Adjacent sequences:  A143750 A143751 A143752 * A143754 A143755 A143756

KEYWORD

nonn,easy,tabf

AUTHOR

Paul Curtz, Aug 31 2008

STATUS

approved

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Last modified February 18 05:37 EST 2019. Contains 320245 sequences. (Running on oeis4.)