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A158823 formatted as a triangular array:

1
3 1
6 2 2
10 3 4 3
15 4 6 6 4
21 5 8 9 8 5
28 6 10 12 12 10 6
36 7 12 15 16 15 12 7
45 8 14 18 20 20 18 14 8
55 9 16 21 24 25 24 21 16 9
66 10 18 24 28 30 30 28 24 18 10
78 11 20 27 32 35 36 35 32 27 20 11

A158823 formatted as a square array:

1 3 6 10 15 21 28 36 45 55 66 78
1 2 3 4 5 6 7 8 9 10 11
2 4 6 8 10 12 14 16 18 20
3 6 9 12 15 18 21 24 27
4 8 12 16 20 24 28 32
5 10 15 20 25 30 35
6 12 18 24 30 36
7 14 21 28 35
8 16 24 32
9 18 27
10 20
11

A158823 formatted as an upper right triangle:

1 3 6 10 15 21 28 36 45 55 66 78
1 2 3 4 5 6 7 8 9 10 11
2 4 6 8 10 12 14 16 18 20
3 6 9 12 15 18 21 24 27
4 8 12 16 20 24 28 32
5 10 15 20 25 30 35
6 12 18 24 30 36
7 14 21 28 35
8 16 24 32
9 18 27
10 20
11

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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