137439215616
domain: N
Appears in sequences
- a(n) = 2^(n-1)*(2^n - (-1)^n).at n=19A003674
- a(n) = 2^(n-1)*(1+2^n).at n=19A007582
- a(n) = Sum_{k=0..n} binomial(4n+3,4k).at n=9A090408
- Half the number of n X 2 0..2 arrays with no element equal to the sum mod 3 of its horizontal and vertical neighbors.at n=18A183495
- Number of n X 2 0..7 arrays with no element x(i,j) adjacent to itself or value 7-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 4 5 and 6, 2 appearing before 3 4 and 5, and 3 appearing before 4 in row major order (unlabeled 8-colorings with no clashing color pairs).at n=10A233196
- Triangular numbers representable as 2^x + 2^y.at n=20A262242
- a(n) = Sum_{k=0..n} binomial(3*n,4*k).at n=13A387846
- a(n) = Sum_{k=0..n} binomial(2*n+1,4*k).at n=19A387869