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A182025 a(n) = 31*binomial(2*n,n-4) + Sum_{i=1..n-4} binomial(2*n,n-4-i)*(4+i). 1

%I #17 Apr 05 2019 10:43:53

%S 0,0,0,0,31,315,2112,11830,60060,287028,1317840,5883768,25741485,

%T 110921525,472431960,1993896450,8354335080,34799391000,144259293600,

%U 595644532560,2451231964350,10059146122662,41181227878560,168246990214380,686162857445736,2794089011606200,11362424624634720,46152024284293200,187266363241782825

%N a(n) = 31*binomial(2*n,n-4) + Sum_{i=1..n-4} binomial(2*n,n-4-i)*(4+i).

%H Olivia Beckwith, Victor Luo, Stephen J. Miller, Karen Shen, Nicholas Triantafillou, <a href="http://arxiv.org/abs/1112.3719">Distribution of Eigenvalues of Weighted, Structured Matrix Ensembles</a>, arXiv preprint arXiv:1112.3719 [math.PR], 2011-2012.

%H Olivia Beckwith, Victor Luo, Stephen J. Miller, Karen Shen, Nicholas Triantafillou, <a href="https://www.emis.de/journals/INTEGERS/papers/p21/p21.Abstract.html">Distribution of Eigenvalues of Weighted, Structured Matrix Ensembles</a>, Electronic Journal of Combinatorial Number Theory, Volume 15 (2015) #A21.

%F Conjecture: 558*(n-4)*(n+4)*a(n) +7*(-631*n^2+777*n+4600)*a(n-1) +4370*(n-1)*(2*n-3)*a(n-2)=0. - _R. J. Mathar_, Aug 08 2012

%p f:=n->31*binomial(2*n,n-4)+add(binomial(2*n,n-4-i)*(4+i),i=1..n-4);

%p [seq(f(n),n=0..40)];

%t Table[31*Binomial[2n,n-4]+Sum[Binomial[2n,n-4-i](4+i),{i,n-4}],{n,0,30}] (* _Harvey P. Dale_, May 24 2016 *)

%o (PARI) a(n) = 31*binomial(2*n,n-4) + sum(i=1, n-4, binomial(2*n,n-4-i)*(4+i)); \\ _Michel Marcus_, Apr 05 2019

%Y Cf. A182026.

%K nonn

%O 0,5

%A _N. J. A. Sloane_, Apr 06 2012

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Last modified April 24 05:26 EDT 2024. Contains 371918 sequences. (Running on oeis4.)