A021009 - OEIS

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A021009 as a triangular array

1

1 -1

2 -4 1

6 -18 9 -1

24 -96 72 -16 1

120 -600 600 -200 25 -1

720 -4320 5400 -2400 450 -36 1

5040 -35280 52920 -29400 7350 -882 49 -1

40320 -322560 564480 -376320 117600 -18816 1568 -64 1

362880 -3265920

A021009 as a square array

`1`	`1`	`2`	`6`	`24`	`120`	`720`	`5040`	`40320`	`362880`
`-1`	`-4`	`-18`	`-96`	`-600`	`-4320`	`-35280`	`-322560`	`-3265920`
`1`	`9`	`72`	`600`	`5400`	`52920`	`564480`
`-1`	`-16`	`-200`	`-2400`	`-29400`	`-376320`
`1`	`25`	`450`	`7350`	`117600`
`-1`	`-36`	`-882`	`-18816`
`1`	`49`	`1568`
`-1`	`-64`
`1`

A021009 as an upper right triangle

`1`	`1`	`2`	`6`	`24`	`120`	`720`	`5040`	`40320`	`362880`
	`-1`	`-4`	`-18`	`-96`	`-600`	`-4320`	`-35280`	`-322560`	`-3265920`
		`1`	`9`	`72`	`600`	`5400`	`52920`	`564480`
			`-1`	`-16`	`-200`	`-2400`	`-29400`	`-376320`
				`1`	`25`	`450`	`7350`	`117600`
					`-1`	`-36`	`-882`	`-18816`
						`1`	`49`	`1568`
							`-1`	`-64`
								`1`

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Last modified May 14 12:38 EDT 2024. Contains 372533 sequences. (Running on oeis4.)