A372976 Number of minimum edge covers in the n-double cone graph.

27, 64, 75, 132, 147, 224, 243, 340, 363, 480, 507, 644, 675, 832, 867, 1044, 1083, 1280, 1323, 1540, 1587, 1824, 1875, 2132, 2187, 2464, 2523, 2820, 2883, 3200, 3267, 3604, 3675, 4032, 4107, 4484, 4563, 4960, 5043, 5460, 5547, 5984, 6075, 6532, 6627, 7104

Offset

3,1

Links

Table of n, a(n) for n=3..48.

Eric Weisstein's World of Mathematics, Double Cone Graph.

Eric Weisstein's World of Mathematics, Minimum Edge Cover.

Formula

a(n) = 3*n^2 + 4*n if (n mod 2 = 0), otherwise 3*n^2. - Detlef Meya, Jun 20 2024

Mathematica

a[n_] := If[Mod[n, 2] == 0, 3*n^2 + 4*n, 3*n^2]; Table[a[n], {n, 3, 44}] (* Detlef Meya, Jun 20 2024 *)

Crossrefs

Sequence in context: A338556 A304563 A304557 * A088248 A319389 A340700

Adjacent sequences: A372973 A372974 A372975 * A372977 A372978 A372979

Keyword

nonn,changed

Author

Eric W. Weisstein, May 26 2024

Extensions

a(10) and beyond from Detlef Meya, Jun 20 2024

Status

approved