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%I #12 Jul 12 2018 08:07:55
%S 2,4,4,4,16,32,64,128,128,320,1152,1792,3584,8704,16384,28672,65536,
%T 118784,221184,483328,851968,1720320,3866624,6815744,14483456,
%U 31719424,55574528,113770496,246939648,438304768,837812224,1790967808,3309305856
%N Consider the Watanabe tag system defined in A291067; a(n) = number of binary words of length n which terminate at the empty word.
%H Don Reble, <a href="/A291780/b291780.txt">Table of n, a(n) for n = 1..60</a>
%Y Cf. A284116, A291067, A291781.
%K nonn
%O 1,1
%A _Don Reble_ and _N. J. A. Sloane_, Sep 01 2017
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