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a(n) = A027170(2n, n).
0

%I #7 Oct 24 2019 19:13:16

%S 1,10,42,156,570,2096,7784,29168,110106,418128,1595616,6113740,

%T 23505352,90633796,350351636,1357278296,5268292826,20483876816,

%U 79765662896,311038321436,1214362277696,4746455801876,18570960418916

%N a(n) = A027170(2n, n).

%K nonn

%O 0,2

%A _Clark Kimberling_