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A038722 formatted as a triangular array:

1
3 2
6 5 4
10 9 8 7
15 14 13 12 11
21 20 19 18 17 16
28 27 26 25 24 23 22
36 35 34 33 32 31 30 29
45 44 43 42 41 40 39 38 37
55 54 53 52 51 50 49 48 47 46
66 65 64 63 62 61 60 59 58 57 56

A038722 formatted as a square array:

1 3 6 10 15 21 28 36 45 55 66
2 5 9 14 20 27 35 44 54 65
4 8 13 19 26 34 43 53 64
7 12 18 25 33 42 52 63
11 17 24 32 41 51 62
16 23 31 40 50 61
22 30 39 49 60
29 38 48 59
37 47 58
46 57
56

A038722 formatted as an upper right triangle:

1 3 6 10 15 21 28 36 45 55 66
2 5 9 14 20 27 35 44 54 65
4 8 13 19 26 34 43 53 64
7 12 18 25 33 42 52 63
11 17 24 32 41 51 62
16 23 31 40 50 61
22 30 39 49 60
29 38 48 59
37 47 58
46 57
56

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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