423644304721
domain: N
Appears in sequences
- a(n) = (3^n - 1)/2.at n=25A003462
- a(n) = 2*a(n-1) + 3*a(n-2), a(0) = a(1) = 1.at n=25A046717
- Binomial transform of Jacobsthal gap sequence (A080924).at n=25A080925
- a(n) = (3*9^n - 1)/2.at n=12A096053
- a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 1,4,14,41.at n=24A132357
- a(n) = (3^n-1)/2 if n odd, (3^n-1)/8 if n even.at n=25A152298
- a(n) = (3*3^n-(-1)^n)/2.at n=24A164907
- The 3 X 3 X ... X 3 dots problem (3, n times): minimal number of straight lines (connected at their endpoints) required to pass through 3^n dots arranged in a 3 X 3 X ... X 3 grid.at n=25A261547