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A091776 a(1)= 1, a(n+1) = a(n)*{a(n)+1)}*{a(n)+2)*...*{a(n)+n-1)}/n. 2
1, 1, 1, 2, 30, 6678144, 14783742920460482277828601638764478251520 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

The next term, a(8), has 281 digits. - T. D. Noe, Oct 25 2004

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

a(2)=1/1=1, a(3)=1*2/2=1, a(4)=1*2*3/3=2, a(5)=2*3*4*5/4=30.

MATHEMATICA

a[1]=1; a[n_] := Times@@Range[a[n-1], a[n-1]+n-2]/(n-1); Table[a[i], {i, 7}]

CROSSREFS

Cf. A091777.

Sequence in context: A113511 A292048 A062008 * A159578 A221192 A178194

Adjacent sequences:  A091773 A091774 A091775 * A091777 A091778 A091779

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Feb 16 2004

EXTENSIONS

Corrected and extended by T. D. Noe, Oct 25 2004

STATUS

approved

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Last modified November 18 07:01 EST 2018. Contains 317279 sequences. (Running on oeis4.)