A087644 - OEIS

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A087644 as a triangular array

										1
									1		3
								1		6		12
							1		10		36		60
						1		15		86		240		360
					1		21		176		756		1800		2520
				1		28		323		1988		7092		15120		20160
			1		36		547		4572		22996		71856		141120		181440
		1		45		871		9495		64144		278820		787824		1451520		1814400
	1		55		1321		18205		159094

A087644 as a square array

1	1	1	1	1	1	1	1	1	1
3	6	10	15	21	28	36	45	55
12	36	86	176	323	547	871	1321
60	240	756	1988	4572	9495	18205
360	1800	7092	22996	64144	159094
2520	15120	71856	278820
20160	141120	787824
181440	1451520
1814400

A087644 as an upper right triangle

1	1	1	1	1	1	1	1	1	1
	3	6	10	15	21	28	36	45	55
		12	36	86	176	323	547	871	1321
			60	240	756	1988	4572	9495	18205
				360	1800	7092	22996	64144	159094
					2520	15120	71856	278820
						20160	141120	787824
							181440	1451520
								1814400