A121428 - OEIS

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A121428 as a triangular array

1

1 1

1 2 5

1 3 11 45

1 4 18 101 581

1 5 26 169 1305 9730

1 6 35 250 2190 21745 199692

1 7 45 345 3255 36360 443329 4843125

1 8 56 455 4520 53916 737051 10679494 135345925

1 9 68 581 6006 74781 1087583 17645187

A121428 as a square array

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
`1`	`2`	`3`	`4`	`5`	`6`	`7`	`8`	`9`
`5`	`11`	`18`	`26`	`35`	`45`	`56`	`68`
`45`	`101`	`169`	`250`	`345`	`455`	`581`
`581`	`1305`	`2190`	`3255`	`4520`	`6006`
`9730`	`21745`	`36360`	`53916`	`74781`
`199692`	`443329`	`737051`	`1087583`
`4843125`	`10679494`	`17645187`
`135345925`

A121428 as an upper right triangle

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
	`1`	`2`	`3`	`4`	`5`	`6`	`7`	`8`	`9`
		`5`	`11`	`18`	`26`	`35`	`45`	`56`	`68`
			`45`	`101`	`169`	`250`	`345`	`455`	`581`
				`581`	`1305`	`2190`	`3255`	`4520`	`6006`
					`9730`	`21745`	`36360`	`53916`	`74781`
						`199692`	`443329`	`737051`	`1087583`
							`4843125`	`10679494`	`17645187`
								`135345925`

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Last modified May 10 05:27 EDT 2024. Contains 372356 sequences. (Running on oeis4.)