A131240 - OEIS

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A131240 as a triangular array

1

2 1

2 2 1

2 4 2 1

2 4 6 2 1

2 6 6 8 2 1

2 6 12 8 10 2 1

2 8 12 20 10 12 2 1

2 8 20 20 30 12 14 2 1

2 10 20 40 30 42 14 16 2 1

2 10 30 40 70 42 56 16 18 2 1

2 12 30 70 70 112 56 72 18 20 2 1

A131240 as a square array

`1`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`
`1`	`2`	`4`	`4`	`6`	`6`	`8`	`8`	`10`	`10`	`12`
`1`	`2`	`6`	`6`	`12`	`12`	`20`	`20`	`30`	`30`
`1`	`2`	`8`	`8`	`20`	`20`	`40`	`40`	`70`
`1`	`2`	`10`	`10`	`30`	`30`	`70`	`70`
`1`	`2`	`12`	`12`	`42`	`42`	`112`
`1`	`2`	`14`	`14`	`56`	`56`
`1`	`2`	`16`	`16`	`72`
`1`	`2`	`18`	`18`
`1`	`2`	`20`
`1`	`2`
`1`

A131240 as an upper right triangle

`1`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`	`2`
	`1`	`2`	`4`	`4`	`6`	`6`	`8`	`8`	`10`	`10`	`12`
		`1`	`2`	`6`	`6`	`12`	`12`	`20`	`20`	`30`	`30`
			`1`	`2`	`8`	`8`	`20`	`20`	`40`	`40`	`70`
				`1`	`2`	`10`	`10`	`30`	`30`	`70`	`70`
					`1`	`2`	`12`	`12`	`42`	`42`	`112`
						`1`	`2`	`14`	`14`	`56`	`56`
							`1`	`2`	`16`	`16`	`72`
								`1`	`2`	`18`	`18`
									`1`	`2`	`20`
										`1`	`2`
											`1`

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Last modified April 18 20:26 EDT 2024. Contains 371781 sequences. (Running on oeis4.)