A127773 - OEIS

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A127773 as a triangular array

										1
									0		3
								0		0		6
							0		0		0		10
						0		0		0		0		15
					0		0		0		0		0		21
				0		0		0		0		0		0		28
			0		0		0		0		0		0		0		36
		0		0		0		0		0		0		0		0		45
	0		0		0		0		0		0		0		0		0		55

A127773 as a square array

1	0	0	0	0	0	0	0	0	0
3	0	0	0	0	0	0	0	0
6	0	0	0	0	0	0	0
10	0	0	0	0	0	0
15	0	0	0	0	0
21	0	0	0	0
28	0	0	0
36	0	0
45	0
55

A127773 as an upper right triangle

1	0	0	0	0	0	0	0	0	0
	3	0	0	0	0	0	0	0	0
		6	0	0	0	0	0	0	0
			10	0	0	0	0	0	0
				15	0	0	0	0	0
					21	0	0	0	0
						28	0	0	0
							36	0	0
								45	0
									55