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%I #7 Sep 18 2019 19:54:07
%S 1,3,29,286,2955,31350,338513,3701268,40849164,454106770,5077352709,
%T 57037374596,643249683466,7278351281985,82587176568765,
%U 939405430122520,10708295003335044,122293746883319148,1398985504993006671,16027662449198124300,183869540691211039945
%N T(4n,n), where T is the array in A026148.
%K nonn
%O 0,2
%A _Clark Kimberling_
%E a(7) corrected and more terms from _Sean A. Irvine_, Sep 18 2019