A006293 Pseudo-bricks with n nodes. (Formerly M4015)

1, 5, 56, 945, 28569, 1421360

Offset

4,2

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=4..9.

T. R. S. Walsh, Counting unlabeled three-connected and homeomorphically irreducible two-connected graphs, J. Combin. Theory Ser. B 32 (1982), no. 1, 12-32.

Index entries for sequences related to bricks

Crossrefs

Cf. A006291, A006292.

Sequence in context: A073563 A006658 A221160 * A367155 A298689 A357392

Adjacent sequences: A006290 A006291 A006292 * A006294 A006295 A006296

Keyword

nonn,more

Author

N. J. A. Sloane.

Status

approved