a(n)=1/(4i)*sum( i^k*tan(k*Pi/4/n)) where 1<=k<=n and (k,n)=1.
1, 2, 2, 2, 4, 4, 4, 6, 4, 6, 8, 6, 8, 8, 8, 8, 12, 10, 8, 16, 12, 12, 16, 10
2 seqfan posts
Fri Oct 21 21:18:09 CEST 2011 [seqfan] Re: Problem with A086224 cross refs
Fri Oct 21 21:03:15 CEST 2011 [seqfan] Problem with A086224 cross refs
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
Links to OEIS content are included according to
The OEIS End-User License Agreement
.