190919389184
domain: N
Appears in sequences
- a(n) = 4*a(n-1) - 2*a(n-2) with a(0) = 1, a(1) = 4.at n=21A007070
- Row sums of triangle A099605, in which row n equals the inverse Binomial transform of column n of the triangle A034870 of even-indexed rows of Pascal's triangle.at n=21A099606
- The number of 1 by n Haunted Mirror Maze puzzles with a unique solution ending with a mirror, where mirror orientation is fixed.at n=22A204089