A209720 - OEIS

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A209720 as a triangular array

1

2 2

5 13 5

12 115 115 12

33 1468 5822 1468 33

87 19993 411940 411940 19993 87

227 242036 29021568 152691350 29021568 242036 227

583 2830612 1712295424

A209720 as a square array

`1`	`2`	`5`	`12`	`33`	`87`	`227`	`583`
`2`	`13`	`115`	`1468`	`19993`	`242036`	`2830612`
`5`	`115`	`5822`	`411940`	`29021568`	`1712295424`
`12`	`1468`	`411940`	`152691350`
`33`	`19993`	`29021568`
`87`	`242036`
`227`

A209720 as an upper right triangle

`1`	`2`	`5`	`12`	`33`	`87`	`227`	`583`
	`2`	`13`	`115`	`1468`	`19993`	`242036`	`2830612`
		`5`	`115`	`5822`	`411940`	`29021568`	`1712295424`
			`12`	`1468`	`411940`	`152691350`
				`33`	`19993`	`29021568`
					`87`	`242036`
						`227`

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Last modified April 23 15:20 EDT 2024. Contains 371916 sequences. (Running on oeis4.)