A115991 - OEIS

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A115991 as a triangular array

1

1 1

5 3 1

13 9 5 1

49 31 17 7 1

161 105 61 29 9 1

581 371 217 111 45 11 1

2045 1313 781 417 189 65 13 1

7393 4719 2825 1551 753 303 89 15 1

26689 17041 10277 5757 2921 1289 461 117 17 1

A115991 as a square array

`1`	`1`	`5`	`13`	`49`	`161`	`581`	`2045`	`7393`	`26689`
`1`	`3`	`9`	`31`	`105`	`371`	`1313`	`4719`	`17041`
`1`	`5`	`17`	`61`	`217`	`781`	`2825`	`10277`
`1`	`7`	`29`	`111`	`417`	`1551`	`5757`
`1`	`9`	`45`	`189`	`753`	`2921`
`1`	`11`	`65`	`303`	`1289`
`1`	`13`	`89`	`461`
`1`	`15`	`117`
`1`	`17`
`1`

A115991 as an upper right triangle

`1`	`1`	`5`	`13`	`49`	`161`	`581`	`2045`	`7393`	`26689`
	`1`	`3`	`9`	`31`	`105`	`371`	`1313`	`4719`	`17041`
		`1`	`5`	`17`	`61`	`217`	`781`	`2825`	`10277`
			`1`	`7`	`29`	`111`	`417`	`1551`	`5757`
				`1`	`9`	`45`	`189`	`753`	`2921`
					`1`	`11`	`65`	`303`	`1289`
						`1`	`13`	`89`	`461`
							`1`	`15`	`117`
								`1`	`17`
									`1`

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Last modified April 24 06:34 EDT 2024. Contains 371920 sequences. (Running on oeis4.)