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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A140981 Number of graphs with n vertices that have an even determinant for the adjacency matrix.

Original entry on oeis.org

1, 1, 4, 7, 34, 109, 1044, 8303, 274668, 7451736, 1018997864
Offset: 1

Views

Author

Tanya Khovanova, Aug 18 2008

Keywords

Crossrefs

Cf. A000088, A103869, A141040.

Formula

a(n) = A000088(n) - A141040(n/2) for n even, a(n) = A000088(n) for n odd.

Extensions

a(8)-a(10) from Andrew Howroyd, Nov 04 2017
a(11) from A000088 added by Max Alekseyev, Feb 20 2024

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