A075883 a(1) = a(2) = 1; a(n) = a(n-1) + a(n-2)! for n > 2.

1, 1, 2, 3, 5, 11, 131, 39916931

Offset

1,3

Comments

The next term (a(9)) has 222 digits. - Harvey P. Dale, Apr 22 2014

Links

Table of n, a(n) for n=1..8.

Mathematica

a = {1, 1}; For[i = 3, i <= 8, i++, c = (a[[i - 1]] + a[[i - 2]]!); a = Append[a, c]]; a
RecurrenceTable[{a[1]==a[2]==1, a[n]==a[n-1]+a[n-2]!}, a, {n, 8}] (* Harvey P. Dale, Apr 22 2014 *)

Crossrefs

Sequence in context: A056163 A118573 A051835 * A195815 A327428 A220346

Adjacent sequences: A075880 A075881 A075882 * A075884 A075885 A075886

Keyword

nonn

Author

Joseph L. Pe, Oct 17 2002

Status

approved