A289470 Number of strictly 2-connected graphs with n edges.

1, 0, 1, 1, 2, 3, 7, 15, 39, 107, 324, 1072, 3778, 14228, 56568, 235449, 1021381, 4596328, 21383982, 102594132, 506544749, 2569520447, 13372902590, 71322154244, 389402949706

Offset: 1

Author

Ed Pegg Jr, Jul 06 2017

Keywords

• nonn
• more

Crossrefs

Cf. A002218, A002840, A010355, A289471, A338511.

Formula

a(n) = A010355(n) - A338511(n). - Andrew Howroyd, May 03 2021

Extensions

a(12)-a(13) corrected and a(14)-a(25) from Andrew Howroyd, May 03 2021