login
Number of even cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506.
7

%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