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A086207 Sum of rank(M) over all n X n matrices over GF(4). 1


%S 3,435,704403,15823018515,5272966965638163,26837910294320000900115,

%T 2117959516569888987677094001683,

%U 2614420107255201240346554326291784252435,50761384915342243255034590495173254359633089772563,15560120110421752320376568335982564883819269596340271934585875

%N Sum of rank(M) over all n X n matrices over GF(4).

%F a(n) = Sum_{r=1..n} r*Product_{j=0..r-1} (q^n-q^j)^2/(q^r-q^j) with q=4.

%o (PARI) a(n) = {my(q=4); sum(r=1, n, r*prod(j=0, r-1, (q^n-q^j)^2/(q^r-q^j)))}

%Y Cf. A086190, A086098.

%K nonn

%O 1,1

%A Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 27 2003

%E a(6)-a(10) from _Andrew Howroyd_, Jul 08 2018

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Last modified November 27 09:19 EST 2021. Contains 349365 sequences. (Running on oeis4.)