A257621 - OEIS

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A257621 as a triangular array

1

3 3

9 42 9

27 393 393 27

81 3156 8646 3156 81

243 23631 142446 142446 23631 243

729 171006 2015895 4273380 2015895 171006 729

2187 1216725 26107983 102402705 102402705 26107983 1216725 2187

6561 8584872 320039388 2136524184 3891302790 2136524184 320039388 8584872 6561

A257621 as a square array

`1`	`3`	`9`	`27`	`81`	`243`	`729`	`2187`	`6561`
`3`	`42`	`393`	`3156`	`23631`	`171006`	`1216725`	`8584872`
`9`	`393`	`8646`	`142446`	`2015895`	`26107983`	`320039388`
`27`	`3156`	`142446`	`4273380`	`102402705`	`2136524184`
`81`	`23631`	`2015895`	`102402705`	`3891302790`
`243`	`171006`	`26107983`	`2136524184`
`729`	`1216725`	`320039388`
`2187`	`8584872`
`6561`

A257621 as an upper right triangle

`1`	`3`	`9`	`27`	`81`	`243`	`729`	`2187`	`6561`
	`3`	`42`	`393`	`3156`	`23631`	`171006`	`1216725`	`8584872`
		`9`	`393`	`8646`	`142446`	`2015895`	`26107983`	`320039388`
			`27`	`3156`	`142446`	`4273380`	`102402705`	`2136524184`
				`81`	`23631`	`2015895`	`102402705`	`3891302790`
					`243`	`171006`	`26107983`	`2136524184`
						`729`	`1216725`	`320039388`
							`2187`	`8584872`
								`6561`

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Last modified April 24 13:58 EDT 2024. Contains 371960 sequences. (Running on oeis4.)