A155997 - OEIS

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A155997 as a triangular array

												2
											1		1
										2		0		2
									1		3		3		1
								2		0		12		0		2
							1		5		10		10		5		1
						2		0		30		0		30		0		2
					1		7		21		35		35		21		7		1
				2		0		56		0		140		0		56		0		2
			1		9		36		84		126		126		84		36		9		1
		2		0		90		0		420		0		420		0		90		0		2
	1		11		55		165		330		462		462		330		165		55		11		1

A155997 as a square array

2	1	2	1	2	1	2	1	2	1	2	1
1	0	3	0	5	0	7	0	9	0	11
2	3	12	10	30	21	56	36	90	55
1	0	10	0	35	0	84	0	165
2	5	30	35	140	126	420	330
1	0	21	0	126	0	462
2	7	56	84	420	462
1	0	36	0	330
2	9	90	165
1	0	55
2	11
1

A155997 as an upper right triangle

2	1	2	1	2	1	2	1	2	1	2	1
	1	0	3	0	5	0	7	0	9	0	11
		2	3	12	10	30	21	56	36	90	55
			1	0	10	0	35	0	84	0	165
				2	5	30	35	140	126	420	330
					1	0	21	0	126	0	462
						2	7	56	84	420	462
							1	0	36	0	330
								2	9	90	165
									1	0	55
										2	11
											1