A008305 - OEIS

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A008305 as a triangular array

1

1 2

1 2 6

1 2 9 24

1 2 13 44 120

1 2 20 80 265 720

1 2 31 144 579 1854 5040

1 2 49 264 1265 4738 14833 40320

1 2 78 484 2783 12072 43387 133496 362880

1 2 125 888 6208 30818 126565 439792 1334961 3628800

A008305 as a square array

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`
`6`	`9`	`13`	`20`	`31`	`49`	`78`	`125`
`24`	`44`	`80`	`144`	`264`	`484`	`888`
`120`	`265`	`579`	`1265`	`2783`	`6208`
`720`	`1854`	`4738`	`12072`	`30818`
`5040`	`14833`	`43387`	`126565`
`40320`	`133496`	`439792`
`362880`	`1334961`
`3628800`

A008305 as an upper right triangle

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`
		`6`	`9`	`13`	`20`	`31`	`49`	`78`	`125`
			`24`	`44`	`80`	`144`	`264`	`484`	`888`
				`120`	`265`	`579`	`1265`	`2783`	`6208`
					`720`	`1854`	`4738`	`12072`	`30818`
						`5040`	`14833`	`43387`	`126565`
							`40320`	`133496`	`439792`
								`362880`	`1334961`
									`3628800`

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Last modified April 24 07:50 EDT 2024. Contains 371922 sequences. (Running on oeis4.)