1,3

Table of n, a(n) for n=1..10.

Eric Weisstein's World of Mathematics, Andrasfai Graph

Eric Weisstein's World of Mathematics, Chordless Cycle

First 10 terms are described by the G.f. x*(x - 3*x^3 + 4*x^4 + x^5)/(-1 + x)^8.

Cf. A234602.

Sequence in context: A070736 A051836 A278670 * A070051 A087235 A222346

Adjacent sequences: A301768 A301769 A301770 * A301772 A301773 A301774

nonn,more

Eric W. Weisstein, Mar 26 2018

a(8)-a(10) from Andrew Howroyd, Mar 26 2018

approved