A091776 - OEIS

A091776

a(1)= 1, a(n+1) = a(n)*(a(n)+1)*(a(n)+2)*...*(a(n)+n-1)/n.

1, 1, 1, 2, 30, 6678144, 14783742920460482277828601638764478251520

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OFFSET

1,4

COMMENTS

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

LINKS

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

KEYWORD

nonn

AUTHOR

EXTENSIONS

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

STATUS

approved