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

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 A376416 A221192

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