39912

Appears in sequences

• Numbers having four 6's in base 9.at n=6A043480
• Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 3 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.at n=12A123773
• Triangle T, read by rows, where column k equals the eigensequence of matrix power T^k.at n=68A125653
• Column 2 of triangle A125653; also equals the eigensequence of the matrix square of A125653.at n=9A125655
• Square array A(n,k), n>=0, k>=0, read by antidiagonals downwards, where column k is the expansion of Product_{j=0..k} (1 + j*x)/(1 - j*x).at n=62A383900
• Expansion of Product_{k=0..3} (1 + k*x)/(1 - k*x).at n=7A383910