A169803 - OEIS

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A169803 as a triangular array

													1
												1		1
											1		2		0
										1		3		1		0
									1		4		3		0		0
								1		5		6		1		0		0
							1		6		10		4		0		0		0
						1		7		15		10		1		0		0		0
					1		8		21		20		5		0		0		0		0
				1		9		28		35		15		1		0		0		0		0
			1		10		36		56		35		6		0		0		0		0		0
		1		11		45		84		70		21		1		0		0		0		0		0
	1		12		55		120		126		56		7		0		0		0		0		0		0

A169803 as a square array

1	1	1	1	1	1	1	1	1	1	1	1	1
1	2	3	4	5	6	7	8	9	10	11	12
0	1	3	6	10	15	21	28	36	45	55
0	0	1	4	10	20	35	56	84	120
0	0	0	1	5	15	35	70	126
0	0	0	0	1	6	21	56
0	0	0	0	0	1	7
0	0	0	0	0	0
0	0	0	0	0
0	0	0	0
0	0	0
0	0
0

A169803 as an upper right triangle

1	1	1	1	1	1	1	1	1	1	1	1	1
	1	2	3	4	5	6	7	8	9	10	11	12
		0	1	3	6	10	15	21	28	36	45	55
			0	0	1	4	10	20	35	56	84	120
				0	0	0	1	5	15	35	70	126
					0	0	0	0	1	6	21	56
						0	0	0	0	0	1	7
							0	0	0	0	0	0
								0	0	0	0	0
									0	0	0	0
										0	0	0
											0	0
												0