1,1
a(4) has 292 digits and is too large to include.
Cf. A000215, A053067, A133013.
Sequence in context: A160362 A155852 A003392 * A100339 A195626 A158247
Adjacent sequences: A133023 A133024 A133025 * A133027 A133028 A133029
base,bref,easy,nonn
Omar E. Pol (info(AT)polprimos.com), Nov 09 2007