A219173 - OEIS

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A219173 as a triangular array

										3
									3		3
								6		7		6
							10		23		23		10
						15		53		146		53		15
					21		103		644		644		103		21
				28		182		2399		5853		2399		182		28
			36		302		8024		43013		43013		8024		302		36
		45		478		24670		276278		602498		276278		24670		478		45
	55		728		70595		1613256		7275277		7275277

A219173 as a square array

3	3	6	10	15	21	28	36	45	55
3	7	23	53	103	182	302	478	728
6	23	146	644	2399	8024	24670	70595
10	53	644	5853	43013	276278	1613256
15	103	2399	43013	602498	7275277
21	182	8024	276278	7275277
28	302	24670
36	478
45

A219173 as an upper right triangle

3	3	6	10	15	21	28	36	45	55
	3	7	23	53	103	182	302	478	728
		6	23	146	644	2399	8024	24670	70595
			10	53	644	5853	43013	276278	1613256
				15	103	2399	43013	602498	7275277
					21	182	8024	276278	7275277
						28	302	24670
							36	478
								45