A002935 Number of series-reduced star graphs with n edges.

1, 1, 2, 5, 9, 22, 62, 177, 560, 1939, 7067, 27331, 110871, 468684, 2057161, 9341736

Offset: 3

Author

N. J. A. Sloane

Keywords

• nonn
• nice
• more

References

• N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
• N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

• B. R. Heap, The enumeration of homeomorphically irreducible star graphs, J. Math. Phys., 7 (1966), 1582-1587.

Crossrefs

Row sums of A046752.

Cf. A360879.

Extensions

a(13)-a(17) from Sean A. Irvine, May 18 2020

a(18) from Andrew Howroyd, Feb 25 2023