1,4

Table of n, a(n) for n=1..11.

Eric Weisstein's World of Mathematics, Planar connected graph.

Inverse Euler transform of A049370. - Falk Hüffner, May 12 2019

Cf. A049370.

Sequence in context: A193281 A143921 A082426 * A102088 A297295 A088142

Adjacent sequences: A054378 A054379 A054380 * A054382 A054383 A054384

nonn,hard

Eric W. Weisstein

a(8)-a(11) from formula by Falk Hüffner, May 12 2019

approved