3,1

The first term is the number of nets in a general regular triangular pyramid, not in a tetrahedron.

Sequence in context: A098196 A027961 A018921 this_sequence A011970 A111988 A110652

Adjacent sequences: A103533 A103534 A103535 this_sequence A103537 A103538 A103539

hard,nonn

T. Suzuki (suzuki(AT)scio.co.jp), Mar 22 2005