A377278 - OEIS

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A377278 as a triangular array

										1
									3		3
								3		21		7
							3		21		105		15
						3		21		105		465		31
					3		21		105		465		1953		63
				3		21		105		465		1953		8001		127
			3		21		105		465		1953		8001		32385		255
		3		21		105		465		1953		8001		32385		130305		511
	3		21		105		465		1953		8001		32385		130305		522753		1023

A377278 as a square array

1	3	3	3	3	3	3	3	3	3
3	21	21	21	21	21	21	21	21
7	105	105	105	105	105	105	105
15	465	465	465	465	465	465
31	1953	1953	1953	1953	1953
63	8001	8001	8001	8001
127	32385	32385	32385
255	130305	130305
511	522753
1023

A377278 as an upper right triangle

1	3	3	3	3	3	3	3	3	3
	3	21	21	21	21	21	21	21	21
		7	105	105	105	105	105	105	105
			15	465	465	465	465	465	465
				31	1953	1953	1953	1953	1953
					63	8001	8001	8001	8001
						127	32385	32385	32385
							255	130305	130305
								511	522753
									1023