cp's OEIS Frontend

A326629 Sum of the ninth largest parts of the partitions of n into 10 squarefree parts.

%I A326629 #10 Jul 14 2019 21:09:50
%S A326629 0,0,0,0,0,0,0,0,0,0,1,1,2,2,4,5,8,9,13,17,25,28,38,46,61,71,90,105,
%T A326629 137,156,194,223,278,314,381,435,526,594,706,798,951,1064,1246,1398,
%U A326629 1641,1822,2117,2360,2735,3030,3480,3856,4427,4884,5555,6140,6984
%N A326629 Sum of the ninth largest parts of the partitions of n into 10 squarefree parts.
%H A326629 <a href="/index/Par#part">Index entries for sequences related to partitions</a>
%F A326629 a(n) = Sum_{r=1..floor(n/10)} Sum_{q=r..floor((n-r)/9)} Sum_{p=q..floor((n-q-r)/8)} Sum_{o=p..floor((n-p-q-r)/7)} Sum_{m=o..floor((n-o-p-q-r)/6)} Sum_{l=m..floor((n-m-o-p-q-r)/5)} Sum_{k=l..floor((n-l-m-o-p-q-r)/4)} Sum_{j=k..floor((n-k-l-m-o-p-q-r)/3)} Sum_{i=j..floor((n-j-k-l-m-o-p-q-r)/2)} mu(r)^2 * mu(q)^2 * mu(p)^2 * mu(o)^2 * mu(m)^2 * mu(l)^2 * mu(k)^2 * mu(j)^2 * mu(i)^2 * mu(n-i-j-k-l-m-o-p-q-r)^2 * q, where mu is the Möbius function (A008683).
%F A326629 a(n) = A326627(n) - A326628(n) - A326630(n) - A326631(n) - A326632(n) - A326633(n) - A326634(n) - A326635(n) - A326636(n) - A326637(n).
%t A326629 Table[Sum[Sum[Sum[Sum[Sum[Sum[Sum[Sum[Sum[q * MoebiusMu[r]^2 * MoebiusMu[q]^2 * MoebiusMu[p]^2 * MoebiusMu[o]^2 * MoebiusMu[m]^2 * MoebiusMu[l]^2 * MoebiusMu[k]^2 * MoebiusMu[j]^2 * MoebiusMu[i]^2 * MoebiusMu[n - i - j - k - l - m - o - p - q - r]^2 , {i, j, Floor[(n - j - k - l - m - o - p - q - r)/2]}], {j, k, Floor[(n - k - l - m - o - p - q - r)/3]}], {k, l, Floor[(n - l - m - o - p - q - r)/4]}], {l, m, Floor[(n - m - o - p - q - r)/5]}], {m, o, Floor[(n - o - p - q - r)/6]}], {o, p, Floor[(n - p - q - r)/7]}], {p, q, Floor[(n - q - r)/8]}], {q, r, Floor[(n - r)/9]}], {r, Floor[n/10]}], {n, 0, 50}]
%Y A326629 Cf. A008683, A326626, A326627, A326628, A326630, A326631, A326632, A326633, A326634, A326635, A326636, A326637.
%K A326629 nonn
%O A326629 0,13
%A A326629 _Wesley Ivan Hurt_, Jul 14 2019