A002935 Number of series-reduced star graphs with n edges. (Formerly M1364 N0528)

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

Offset

3,3

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

Table of n, a(n) for n=3..18.

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

Crossrefs

Row sums of A046752.

Cf. A360879.

Sequence in context: A173565 A268651 A342556 * A128266 A088356 A246350

Adjacent sequences: A002932 A002933 A002934 * A002936 A002937 A002938

Keyword

nonn,nice,more

Author

N. J. A. Sloane

Extensions

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

a(18) from Andrew Howroyd, Feb 25 2023

Status

approved