A121281 - OEIS

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A121281 as a triangular array

1

2 1

6 3 2

30 15 10 6

210 105 70 42 30

2310 1155 770 462 330 210

30030 15015 10010 6006 4290 2730 2310

510510 255255 170170 102102 72930 46410 39270 30030

9699690 4849845 3233230 1939938 1385670 881790 746130 570570 510510

A121281 as a square array

`1`	`2`	`6`	`30`	`210`	`2310`	`30030`	`510510`	`9699690`
`1`	`3`	`15`	`105`	`1155`	`15015`	`255255`	`4849845`
`2`	`10`	`70`	`770`	`10010`	`170170`	`3233230`
`6`	`42`	`462`	`6006`	`102102`	`1939938`
`30`	`330`	`4290`	`72930`	`1385670`
`210`	`2730`	`46410`	`881790`
`2310`	`39270`	`746130`
`30030`	`570570`
`510510`

A121281 as an upper right triangle

`1`	`2`	`6`	`30`	`210`	`2310`	`30030`	`510510`	`9699690`
	`1`	`3`	`15`	`105`	`1155`	`15015`	`255255`	`4849845`
		`2`	`10`	`70`	`770`	`10010`	`170170`	`3233230`
			`6`	`42`	`462`	`6006`	`102102`	`1939938`
				`30`	`330`	`4290`	`72930`	`1385670`
					`210`	`2730`	`46410`	`881790`
						`2310`	`39270`	`746130`
							`30030`	`570570`
								`510510`

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Last modified August 30 13:06 EDT 2024. Contains 375543 sequences. (Running on oeis4.)