1,1

Digits need not be distinct. This may be considered row 2 of an infinite array whose 1st row is A038770. Each such row is a subset of the ones above it.

Cf. A038770.

Sequence in context: A045987 A121978 A128997 this_sequence A113600 A097158 A072239

Adjacent sequences: A139135 A139136 A139137 this_sequence A139139 A139140 A139141

base,easy,more,nonn,dumb

Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 05 2008