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a(n) = (1/2)*T(2n,n+1), where T is given by A048113.
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%I #6 Jul 28 2022 03:52:27

%S 0,0,1,3,12,42,156,570,2124,7926,29844,112812,428712,1635108,6259236,

%T 24031260,92517180,357019224,1380671532,5349496152,20762603724,

%U 80709201504,314178212928,1224576411084,4778651920092,18667769062044

%N a(n) = (1/2)*T(2n,n+1), where T is given by A048113.

%Y Cf. A048113.

%K nonn

%O 1,4

%A _Clark Kimberling_