A131108 - OEIS

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A131108 as a triangular array

											1
										1		1
									2		3		1
								2		6		5		1
							2		8		12		7		1
						2		10		20		20		9		1
					2		12		30		40		30		11		1
				2		14		42		70		70		42		13		1
			2		16		56		112		140		112		56		15		1
		2		18		72		168		252		252		168		72		17		1
	2		20		90		240		420		504		420		240		90		19		1

A131108 as a square array

1	1	2	2	2	2	2	2	2	2	2
1	3	6	8	10	12	14	16	18	20
1	5	12	20	30	42	56	72	90
1	7	20	40	70	112	168	240
1	9	30	70	140	252	420
1	11	42	112	252	504
1	13	56	168	420
1	15	72	240
1	17	90
1	19
1

A131108 as an upper right triangle

1	1	2	2	2	2	2	2	2	2	2
	1	3	6	8	10	12	14	16	18	20
		1	5	12	20	30	42	56	72	90
			1	7	20	40	70	112	168	240
				1	9	30	70	140	252	420
					1	11	42	112	252	504
						1	13	56	168	420
							1	15	72	240
								1	17	90
									1	19
										1