29204

Appears in sequences

• Number of permutations that are 2 "block reversals" away from 12...n.at n=18A007972
• Number of step shifted (decimated) sequences using a maximum of two different symbols.at n=18A056371
• Number of regions formed inside square by diagonals and the segments joining the vertices to the points dividing the sides into n equal length segments.at n=40A108914
• a(n) = (1/n) * Sum_{d|n} phi(n/d)*2^(d+1).at n=17A161219
• a(n) = 2^n mod n^3.at n=30A233442