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%I #17 Dec 16 2018 09:10:08
%S 1,1,2,12,65520
%N Number of rooted identity trees of height n. Sets of rank n.
%C Next term is 2^65536 - 65536.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Rank.html">Rank.</a>
%H <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a>
%Y Cf. A004111, A038082-A038093, A048828.
%Y Differences of A014221.
%Y Column sums of A227819.
%K nonn,easy
%O 0,3
%A _Christian G. Bower_, Jan 04 1999