1,5

Table of n, a(n) for n=1..71.

Index entries for sequences related to partitions

a(n) = Sum_{i=1..n} (1 - mu(2*n-i)^2), where mu is the Möbius function (A008683).

Table[Sum[(1 - MoebiusMu[2 n - k]^2), {k, n}], {n, 80}]

(PARI) a(n) = sum(i=1, n, 1 - moebius(2*n-i)^2); \\ Michel Marcus, Feb 11 2018

Cf. A008683, A008966, A057627.

Sequence in context: A108356 A239499 A241139 * A241092 A055656 A078571

Adjacent sequences: A294239 A294240 A294241 * A294243 A294244 A294245

nonn,easy

Wesley Ivan Hurt, Oct 25 2017

approved