A364170 Related to expression as an alternating sum of k-th powers.

1, 3, 6, 10, 26, 170, 7226, 13053770, 42600227803226, 453694852221687377444001770, 51459754733114686962148583993443846186613037940783226, 662026589298079856793872781777756720070052610825509991367405555066143474558289627235647952526950580741770

Offset

1,2

Comments

For n>=3 we have a(n+1) = (1/4)*(a(n)+2)^2 - a(n).

Links

Table of n, a(n) for n=1..12.

E. Lemoine, Sur la décomposition d'un nombre en ses carrés maxima, Assoc. Française pour L'Avancement des Sciences (1896), 73-77.

Mathematica

a[1]=1; a[2]=3; a[3]=6; a[n_]:=(1/4)(a[n-1]+2)^2 - a[n-1]; Array[a, 12] (* Stefano Spezia, Jul 12 2023 *)

Crossrefs

Sequence in context: A117224 A173957 A048006 * A211231 A302094 A068818

Adjacent sequences: A364167 A364168 A364169 * A364171 A364172 A364173

Keyword

nonn,easy

Author

Jeffrey Shallit, Jul 12 2023

Status

approved