70607649841
domain: N
Appears in sequences
- Bending a piece of wire of length n+1; walks of length n+1 on a tetrahedron; also non-branched catafusenes with n+2 condensed hexagons.at n=24A001998
- a(n) = (3^n + 1)^2/4.at n=12A051500
- a(n) = (A046717(n))^2 (starting with n=1).at n=11A120096
- Number of 2 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two.at n=23A221276