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A008867 formatted as a triangular array:

1
3 3
6 7 6
10 12 12 10
15 18 19 18 15
21 25 27 27 25 21
28 33 36 37 36 33 28
36 42 46 48 48 46 42 36
45 52 57 60 61 60 57 52 45
55 63 69 73 75 75 73 69 63 55
66 75 82 87 90 91 90 87 82 75 66

A008867 formatted as a square array:

1 3 6 10 15 21 28 36 45 55 66
3 7 12 18 25 33 42 52 63 75
6 12 19 27 36 46 57 69 82
10 18 27 37 48 60 73 87
15 25 36 48 61 75 90
21 33 46 60 75 91
28 42 57 73 90
36 52 69 87
45 63 82
55 75
66

A008867 formatted as an upper right triangle:

1 3 6 10 15 21 28 36 45 55 66
3 7 12 18 25 33 42 52 63 75
6 12 19 27 36 46 57 69 82
10 18 27 37 48 60 73 87
15 25 36 48 61 75 90
21 33 46 60 75 91
28 42 57 73 90
36 52 69 87
45 63 82
55 75
66

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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