A291439 - OEIS

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A291439 as a triangular array

										1
									2		2
								2		6		2
							4		9		9		4
						6		18		32		18		6
					8		54		103		103		54		8
				13		99		383		590		383		99		13
			17		216		1280		2807		2807		1280		216		17
		27		512		4247		13138		21555		13138		4247		512		27
	40		1079		14354		67564		150063		150063		67564		14354		1079		40

A291439 as a square array

1	2	2	4	6	8	13	17	27	40
2	6	9	18	54	99	216	512	1079
2	9	32	103	383	1280	4247	14354
4	18	103	590	2807	13138	67564
6	54	383	2807	21555	150063
8	99	1280	13138	150063
13	216	4247	67564
17	512	14354
27	1079
40

A291439 as an upper right triangle

1	2	2	4	6	8	13	17	27	40
	2	6	9	18	54	99	216	512	1079
		2	9	32	103	383	1280	4247	14354
			4	18	103	590	2807	13138	67564
				6	54	383	2807	21555	150063
					8	99	1280	13138	150063
						13	216	4247	67564
							17	512	14354
								27	1079
									40