1,7

Table of n, a(n) for n=1..85.

Index entries for sequences related to partitions

a(n) = Sum_{i=1..floor((n-1)/2)} mu(i)^2 * [Omega(n-i) == 2], where [] is the Iverson bracket, mu = A008683 and Omega = A001222.

Table[Sum[MoebiusMu[i]^2 KroneckerDelta[PrimeOmega[n - i], 2], {i, Floor[n/2]}], {n, 100}]

Cf. A001222, A008683, A303119.

Sequence in context: A072906 A239062 A201160 * A228428 A321915 A321748

Adjacent sequences: A302535 A302536 A302537 * A302539 A302540 A302541

nonn,easy

Wesley Ivan Hurt, Apr 18 2018

approved