1,1

Cf. A153022, A045345, A128165, A000040, A007504, A111441

Sequence in context: A091439 A013083 A110387 this_sequence A100359 A052342 A007190

Adjacent sequences: A158679 A158680 A158681 this_sequence A158683 A158684 A158685

nonn

Ctibor O. Zizka (c.zizka(AT)email.cz), Mar 24 2009

Three more terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 26 2009