Search: id:A009764
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%I A009764
%S A009764 0,2,16,272,7936,353792,22368256,1903757312,209865342976,
%T A009764 29088885112832,4951498053124096,1015423886506852352,
%U A009764 246921480190207983616,70251601603943959887872
%N A009764 Expansion of tan(x)^2.
%e A009764 (tan x)^2 = x^2 + 2/3*x^4 + 17/45*x^6 + 62/315*x^8 + ...
%t A009764 Tan[ x ]^2 (* Even Part *)
%Y A009764 Essentially same as A000182.
%Y A009764 Cf. A024283, A000182.
%Y A009764 Sequence in context: A090305 A050974 A012188 this_sequence A000182 A102599 
               A123744
%Y A009764 Adjacent sequences: A009761 A009762 A009763 this_sequence A009765 A009766 
               A009767
%K A009764 nonn,easy
%O A009764 0,2
%A A009764 R. H. Hardin (rhhardin(AT)att.net)
%E A009764 Extended and signs tested Mar 15 1997 by Olivier Gerard.

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