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%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_