A172431 - OEIS

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A172431 as a triangular array

1

1 2

1 4 3

1 6 10 4

1 8 21 20 5

1 10 36 56 35 6

1 12 55 120 126 56 7

1 14 78 220 330 252 84 8

1 16 105 364 715 792 462 120 9

1 18 136 560 1365 2002 1716 792 165 10

A172431 as a square array

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
`2`	`4`	`6`	`8`	`10`	`12`	`14`	`16`	`18`
`3`	`10`	`21`	`36`	`55`	`78`	`105`	`136`
`4`	`20`	`56`	`120`	`220`	`364`	`560`
`5`	`35`	`126`	`330`	`715`	`1365`
`6`	`56`	`252`	`792`	`2002`
`7`	`84`	`462`	`1716`
`8`	`120`	`792`
`9`	`165`
`10`

A172431 as an upper right triangle

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
	`2`	`4`	`6`	`8`	`10`	`12`	`14`	`16`	`18`
		`3`	`10`	`21`	`36`	`55`	`78`	`105`	`136`
			`4`	`20`	`56`	`120`	`220`	`364`	`560`
				`5`	`35`	`126`	`330`	`715`	`1365`
					`6`	`56`	`252`	`792`	`2002`
						`7`	`84`	`462`	`1716`
							`8`	`120`	`792`
								`9`	`165`
									`10`

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Last modified May 20 05:07 EDT 2024. Contains 372703 sequences. (Running on oeis4.)