%I #13 Jan 11 2024 06:33:06
%S 0,0,1,1,3,6,18,37,95,212,528,1226,2936,6822,16212,38081,90717,215414,
%T 516358
%N Number of even cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506.
%C For the convenience of the range notation above, we define A014137(-1) and A014138(-1) as zero.
%H Antti Karttunen, <a href="/A089408/a089408.c.txt">Counted with the help of this C program</a>.
%F a(n) = A081157(n) + A081160(n) + A081162(n) = A057507(n) - A081148(n).
%Y Bisections: A081151, A081152.
%Y Cf. A081157, A081160, A081162, A057507, A081148.
%Y Cf. A014137, A014138, A057505, A057506.
%K nonn,more
%O 0,5
%A _Wouter Meeussen_ and _Antti Karttunen_, Mar 10 2003