R. K. Guy, Building Barrycades, preprint, 2006
Table of n, a(n) for n=1..8.
a(2)=8 since there are eight permutations of (1,2,3,4) satisfying the Fink condition: (1,3,4,2), (1,4,2,3), (1,4,3,2), (2,4,1,3) and their mirror images.
Sequence in context: A153887 A131349 A067964 * A098272 A087540 A052713
Adjacent sequences: A126426 A126427 A126428 * A126430 A126431 A126432
Kevin Saff (kevin.saff(AT)gmail.com), Mar 11 2007