A286849 - OEIS

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A286849 as a triangular array

										1
									2		2
								2		4		2
							4		6		6		4
						4		16		12		16		4
					7		20		36		36		20		7
				9		52		64		256		64		52		9
			13		80		204		400		400		204		80		13
		18		176		446		2704		971		2704		446		176		18
	25		296		1184		6400		6486		6486		6400		1184		296		25

A286849 as a square array

1	2	2	4	4	7	9	13	18	25
2	4	6	16	20	52	80	176	296
2	6	12	36	64	204	446	1184
4	16	36	256	400	2704	6400
4	20	64	400	971	6486
7	52	204	2704	6486
9	80	446	6400
13	176	1184
18	296
25

A286849 as an upper right triangle

1	2	2	4	4	7	9	13	18	25
	2	4	6	16	20	52	80	176	296
		2	6	12	36	64	204	446	1184
			4	16	36	256	400	2704	6400
				4	20	64	400	971	6486
					7	52	204	2704	6486
						9	80	446	6400
							13	176	1184
								18	296
									25