A221881 - OEIS

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A221881 as a triangular array

										1
									1		3
								1		5		7
							1		7		13		15
						1		9		21		29		31
					1		11		31		51		61		63
				1		13		43		83		113		125		127
			1		15		57		127		197		239		253		255
		1		17		73		185		325		437		493		509		511
	1		19		91		259		511		763		931		1003		1021		1023

A221881 as a square array

1	1	1	1	1	1	1	1	1	1
3	5	7	9	11	13	15	17	19
7	13	21	31	43	57	73	91
15	29	51	83	127	185	259
31	61	113	197	325	511
63	125	239	437	763
127	253	493	931
255	509	1003
511	1021
1023

A221881 as an upper right triangle

1	1	1	1	1	1	1	1	1	1
	3	5	7	9	11	13	15	17	19
		7	13	21	31	43	57	73	91
			15	29	51	83	127	185	259
				31	61	113	197	325	511
					63	125	239	437	763
						127	253	493	931
							255	509	1003
								511	1021
									1023