A282746 Number of 2-(n,3,lambda_min) designs.

1, 1, 3077244, 1, 960

Offset: 6

Author

N. J. A. Sloane, Mar 05 2017

Keywords

• nonn
• more

Comments

The corresponding values of lambda_min are 2, 1, 6, 1, 2.

Other known terms are a(12) = 242995846, a(13) = 2, a(15) = 80, a(19) = 11084874829.

Links

• Gholamreza B. Khosrovshahi and Behruz Tayfeh-Rezaie, Classification of simple 2-(11, 3, 3) designs, Discrete Mathematics 309.3 (2009): 515-520.

Crossrefs

Cf. A030129.

Extensions

Edited by Andrei Zabolotskii, Jul 08 2025