1405035520

Appears in sequences

• a(n) = a(n-1) + (3+(-1)^n)*a(n-2)/2.at n=34A007068
• a(n) = 4*a(n-1) - 2*a(n-2) with a(0) = 1, a(1) = 4.at n=17A007070
• Number of n step walks (each step +/-1 starting from 0) which are never more than 3 or less than -3.at n=34A068912
• Expansion of x^3 / (1 - 4*x + 6*x^2 - 4*x^3 + 2*x^4).at n=36A099589
• 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=17A099606
• a(n) = 4*a(n-2) - 2*a(n-4).at n=36A121720
• 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=18A204089
• Expansion of (1+2*x-x^3)/(1-4*x^2+2*x^4).at n=34A217730