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a(n) = (1/2)*(3rd elementary symmetric function of C(n,0), C(n,1), ..., C(n,[ n/2 ])).
0

%I #5 Jan 09 2024 12:02:03

%S 12,25,1155,3136,89012,282339,6356460,22384516,437787537,1663878008,

%T 29545748596,119083774720,1968978205492,8317456369783

%N a(n) = (1/2)*(3rd elementary symmetric function of C(n,0), C(n,1), ..., C(n,[ n/2 ])).

%K nonn

%O 4,1

%A _Clark Kimberling_