Search: id:A152801
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%I A152801
%S A152801 1,2,5,21,87,378,1682,7596,34688,159724,740243,3448579,16134813,
%T A152801 75760294,356811308,1684882778,7974184903,37815280813,179644013528,
%U A152801 854749753320,4072634928710,19429522879905,92799859650401
%N A152801 a(n) = A152800(n+1,2n) for n>=0.
%C A152801 Triangle A152800 gives a q-analog of the Euler numbers.
%o A152801 (PARI) {a(n)=polcoeff(polcoeff(1/sum(m=0,n+1,(-1)^m*x^(2*m)/prod(j=1,
               2*m,(q^j-1)/(q-1))+x*O(x^(2*n+2))),2*n+2,x)*prod(j=1,2*n+2,(q^j-1)/
               (q-1)),2*n,q)}
%Y A152801 Cf. A152800; A152802.
%Y A152801 Sequence in context: A039777 A000941 A000131 this_sequence A062297 A047104 
               A115087
%Y A152801 Adjacent sequences: A152798 A152799 A152800 this_sequence A152802 A152803 
               A152804
%K A152801 nonn
%O A152801 0,2
%A A152801 Paul D. Hanna (pauldhanna(AT)juno.com), Dec 26 2008

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