A005636 Number of n-node connected graphs without points of degree 2. (Formerly M1548)

1, 1, 0, 2, 5, 32, 234, 3638, 106147, 6039504, 633754161, 120131932774, 41036773627286, 25445404202438466, 28918219616495404542, 60799423389360189091576, 238378454962362129667078385

Offset

1,4

References

R. W. Robinson, personal communication.

R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1976.

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

Links

R. W. Robinson, Table of n, a(n) for n = 1..28

R. W. Robinson, Cubic graphs (notes)

Crossrefs

Sequence in context: A221680 A009274 A019036 * A067299 A353195 A203227

Adjacent sequences: A005633 A005634 A005635 * A005637 A005638 A005639

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved