OFFSET
1,3
MATHEMATICA
a[n_] := 1 /; n == 1 a[n_] := 1 /; n == 2 a[n_] := 2^a[n - 1] + 2^a[n - 2] /; n > 2; Table[a[i], {i, 1, 6}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Apr 23 2002
EXTENSIONS
a(6) has 78919 digits.
STATUS
approved