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A162447 Denominators of the column sums of the ZG1 matrix 1
12, 720, 181440, 7257600, 399168000, 1307674368000, 73229764608000, 731699852083200, 229909239772692480000, 84300054583320576000000, 51186993142992253747200000, 21777738900836704321536000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

For the definition of the ZG1 matrix coefficients see A162446.

We define the columns sums by cs(n) = sum(ZG1[2*m-1,n], m = 1.. infinity) for n => 2.

LINKS

Table of n, a(n) for n=2..13.

FORMULA

a(n) = denom(cs(n)) and numer(cs(n)) = A162446(n).

CROSSREFS

See A162446 for the numerators of the column sums.

Sequence in context: A002196 A141421 A000909 * A061025 A042749 A219568

Adjacent sequences:  A162444 A162445 A162446 * A162448 A162449 A162450

KEYWORD

easy,frac,nonn

AUTHOR

Johannes W. Meijer, Jul 06 2009

STATUS

approved

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Last modified September 27 10:35 EDT 2020. Contains 337380 sequences. (Running on oeis4.)