OFFSET
0,4
LINKS
Eric Weisstein's World of Mathematics, Chordless Cycle
Eric Weisstein's World of Mathematics, Hypercube Graph
FORMULA
a(n) = 2^(n - 2)*n*Sum_{j=0..n-3} Sum_{k=3..n-j} 4*((k + 2)*2^(k - 5) - 1). - Detlef Meya, Jun 23 2024
MATHEMATICA
a[n_] := 2^(n - 2)*n*Sum[Sum[4*((k + 2)*2^(k - 5) - 1), {k, 3, n-j}], {j, 0, n-3}]; Table[a[n], {n, 0, 21}] (* Detlef Meya, Jun 23 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric W. Weisstein, Jul 20 2023
EXTENSIONS
a(10) from Pontus von Brömssen, Jul 28 2023
a(11) and beyond from Detlef Meya, Jun 23 2024
STATUS
approved