A203467 - OEIS

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A203467

a(n) = A203309(n)/A000178(n) where A000178 are superfactorials.

1, 2, 15, 630, 198450, 589396500, 19912024006875, 8969371213896843750, 61815874928487448987968750, 7358663747680777931818630148437500, 16862758880642741957030086746987589746093750 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..11.` `R. Chapman, A polynomial taking integer values, Mathematics Magazine, 29 (1996), 121.`
	MATHEMATICA	`f[j_] := j (j + 1)/2; z = 15;` `v[n_] := Product[Product[f[k] - f[j], {j, 1, k - 1}], {k, 2, n}]` `d[n_] := Product[(i - 1)!, {i, 1, n}]` `Table[v[n], {n, 1, z}] (* A203309 )` `Table[v[n + 1]/v[n], {n, 1, z - 1}] ( A203310 )` `Table[v[n]/d[n], {n, 1, 12}] ( A203467 *)`
	CROSSREFS	`Cf. A203309, A203310.` `Sequence in context: A136463 A078475 A015185 * A071627 A013064 A013095` `Adjacent sequences: A203464 A203465 A203466 * A203468 A203469 A203470`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling, Jan 02 2012`
	EXTENSIONS	`Name edited by Michel Marcus, May 17 2019`
	STATUS	`approved`

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Last modified March 28 08:01 EDT 2023. Contains 361579 sequences. (Running on oeis4.)