%I A053488
%S A053488 0,1,2,6,23,103,535,3153,20676,149148,1172343,9960085,90864801,
%T A053488 885278605,9167936406,100508961982,1162366436355,14136151459043,
%U A053488 180287711599455,2405321659729837,33495442060505752,485880832780748932
%N A053488 E.g.f.: exp(exp(sinh(x))-1)-1.
%D A053488 R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see 
               Example 5.1.14.
%Y A053488 Sequence in context: A022558 A005802 A061552 this_sequence A117106 A137534 
               A137535
%Y A053488 Adjacent sequences: A053485 A053486 A053487 this_sequence A053489 A053490 
               A053491
%K A053488 nonn
%O A053488 0,3
%A A053488 N. J. A. Sloane (njas(AT)research.att.com), Jan 15 2000