A001498 - OEIS

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A001498 as a triangular array

1

1 1

1 3 3

1 6 15 15

1 10 45 105 105

1 15 105 420 945 945

1 21 210 1260 4725 10395 10395

1 28 378 3150 17325 62370 135135 135135

1 36 630 6930 51975 270270 945945 2027025 2027025

1 45 990 13860 135135 945945 4729725 16216200 34459425 34459425

A001498 as a square array

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
`1`	`3`	`6`	`10`	`15`	`21`	`28`	`36`	`45`
`3`	`15`	`45`	`105`	`210`	`378`	`630`	`990`
`15`	`105`	`420`	`1260`	`3150`	`6930`	`13860`
`105`	`945`	`4725`	`17325`	`51975`	`135135`
`945`	`10395`	`62370`	`270270`	`945945`
`10395`	`135135`	`945945`	`4729725`
`135135`	`2027025`	`16216200`
`2027025`	`34459425`
`34459425`

A001498 as an upper right triangle

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
	`1`	`3`	`6`	`10`	`15`	`21`	`28`	`36`	`45`
		`3`	`15`	`45`	`105`	`210`	`378`	`630`	`990`
			`15`	`105`	`420`	`1260`	`3150`	`6930`	`13860`
				`105`	`945`	`4725`	`17325`	`51975`	`135135`
					`945`	`10395`	`62370`	`270270`	`945945`
						`10395`	`135135`	`945945`	`4729725`
							`135135`	`2027025`	`16216200`
								`2027025`	`34459425`
									`34459425`

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Last modified May 12 16:52 EDT 2024. Contains 372492 sequences. (Running on oeis4.)