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a(n) = T(n,n-1), where T is the array in A026148.
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%I #7 Jun 23 2013 11:10:30

%S 1,4,10,29,81,230,652,1854,5278,15048,42956,122772,351300,1006344,

%T 2885952,8285001,23809113,68490060,197211394,568385609,1639635613,

%U 4734036134,13679894484,39562904855,114507905551,331674931656,961408814434

%N a(n) = T(n,n-1), where T is the array in A026148.

%F Conjecture: -(n+7)*(31*n-87)*a(n) +(164*n^2+313*n-2115)*a(n-1) +(-182*n^2+229*n+891)*a(n-2) +(-164*n^2+59*n+519)*a(n-3) +3*(71*n-104)*(n-3)*a(n-4)=0. - _R. J. Mathar_, Jun 23 2013

%Y First differences of A026163.

%K nonn

%O 2,2

%A _Clark Kimberling_