A203181 - OEIS

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A203181 as a triangular array

												1
											1		1
										2		1		2
									2		2		2		2
								3		4		7		4		3
							4		6		17		17		6		4
						5		10		41		59		41		10		5
					7		18		97		205		205		97		18		7
				9		30		235		724		952		724		235		30		9
			12		50		607		2466		4654		4654		2466		607		50		12
		16		86		1415		8948		23083		32411		23083		8948		1415		86		16
	21		146

A203181 as a square array

1	1	2	2	3	4	5	7	9	12	16	21
1	1	2	4	6	10	18	30	50	86	146
2	2	7	17	41	97	235	607	1415
2	4	17	59	205	724	2466	8948
3	6	41	205	952	4654	23083
4	10	97	724	4654	32411
5	18	235	2466	23083
7	30	607	8948
9	50	1415
12	86
16

A203181 as an upper right triangle

1	1	2	2	3	4	5	7	9	12	16	21
	1	1	2	4	6	10	18	30	50	86	146
		2	2	7	17	41	97	235	607	1415
			2	4	17	59	205	724	2466	8948
				3	6	41	205	952	4654	23083
					4	10	97	724	4654	32411
						5	18	235	2466	23083
							7	30	607	8948
								9	50	1415
									12	86
										16