%I #6 Oct 27 2019 00:12:23
%S 1,6,27,109,436,1745,6981,27925,111702,446809,1787239,7148958,
%T 28595832,114383330,457533321,1830133286,7320533146,29282132586,
%U 117128530347,468514121391,1874056485564,7496225942259,29984903769037
%N The first n digits of the juxtaposition of the base-4 numbers converted to decimal.
%e 1 (1); 12 (6); 123 (27); 1231 (109); 12310 (436); 123101 (1745); ...
%Y Cf. A055143-A055150.
%K nonn,base
%O 1,2
%A _Patrick De Geest_, Apr 15 2000
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