A020921 - OEIS

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A020921 as a triangular array

1

1 1

0 1 1

0 2 3 1

0 2 5 4 1

0 4 10 10 5 1

0 2 11 19 15 6 1

0 6 21 35 35 21 7 1

0 4 22 52 69 56 28 8 1

0 6 33 83 126 126 84 36 9 1

0 4 34 110 205 251 210 120 45 10 1

0 10 55 165 330 462 462 330 165 55 11

A020921 as a square array

`1`	`1`	`0`	`0`	`0`	`0`	`0`	`0`	`0`	`0`	`0`	`0`
`1`	`1`	`2`	`2`	`4`	`2`	`6`	`4`	`6`	`4`	`10`
`1`	`3`	`5`	`10`	`11`	`21`	`22`	`33`	`34`	`55`
`1`	`4`	`10`	`19`	`35`	`52`	`83`	`110`	`165`
`1`	`5`	`15`	`35`	`69`	`126`	`205`	`330`
`1`	`6`	`21`	`56`	`126`	`251`	`462`
`1`	`7`	`28`	`84`	`210`	`462`
`1`	`8`	`36`	`120`	`330`
`1`	`9`	`45`	`165`
`1`	`10`	`55`
`1`	`11`

A020921 as an upper right triangle

`1`	`1`	`0`	`0`	`0`	`0`	`0`	`0`	`0`	`0`	`0`	`0`
	`1`	`1`	`2`	`2`	`4`	`2`	`6`	`4`	`6`	`4`	`10`
		`1`	`3`	`5`	`10`	`11`	`21`	`22`	`33`	`34`	`55`
			`1`	`4`	`10`	`19`	`35`	`52`	`83`	`110`	`165`
				`1`	`5`	`15`	`35`	`69`	`126`	`205`	`330`
					`1`	`6`	`21`	`56`	`126`	`251`	`462`
						`1`	`7`	`28`	`84`	`210`	`462`
							`1`	`8`	`36`	`120`	`330`
								`1`	`9`	`45`	`165`
									`1`	`10`	`55`
										`1`	`11`

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Last modified April 16 05:35 EDT 2024. Contains 371697 sequences. (Running on oeis4.)