28091

Appears in sequences

• Number of dissimilar ternary squarefree words of length n+1.at n=34A060688
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 0, 1), (1, -1, -1), (1, 1, 0)}.at n=10A148606
• Number of Lucasian primes less than 10^n.at n=6A307121
• Number of nX6 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=7A317861
• Triangle T(n,k) in which the n-th row encodes the inverse of a 3n X 3n Jacobi matrix, with 1's on the lower, main, and upper diagonals in GF(2), where the encoding consists of the decimal representations for the binary rows (n >= 1, 1 <= k <= 3n).at n=40A363146