167365651248
domain: N
Appears in sequences
- One quarter the number of nX3 1..4 arrays with no two neighbors of any element equal to each other.at n=20A183355
- Number of 3Xn binary arrays without the pattern 0 1 diagonally or antidiagonally.at n=22A188825
- a(n) = Sum_{k=0..3^(n-1)} gcd(k,3^(n-1)) for n > 0 and a(0) = 1.at n=22A199923
- a(1) = 1, a(2) = 2, a(3) = 5; thereafter a(n) = 2 * Sum_{k=1..n-1} a(k).at n=24A257970