18206

Appears in sequences

• a(n) = ceiling(a(n-1)*3/2) with a(1) = 1.at n=23A061419
• Triangle read by rows: row n is the first row of the matrix M[n]^(n-1), where M[n] is the n X n tridiagonal matrix with main diagonal (2,4,4,...) and super- and subdiagonals (1,1,1,...).at n=29A124575
• Values of register b when register a becomes 0 for the two register machine {i[1], i[1], i[1], d[2,1], d[1,6], i[2], d[1,5], d[2,3]}.at n=23A156623
• Number of permutations of 1..n containing the relative rank sequence { 153462 } at any spacing.at n=3A159124
• Number of (n+1) X 4 0..3 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=9A206338
• Number of non-equivalent binary n X n matrices with three pairwise nonadjacent 1's.at n=8A232568
• Satisfies Sum_{n>=0} a(n)*x^n = x * Product_{n>=0} (1 + x^n + x^(2*n))^a(n).at n=14A248869
• Expansion of (1 + x + 21*x^2 + x^3 + x^4)/(1 - x)^5.at n=11A257602
• a(n) = n^3/3 - 7*n/3 + 4.at n=38A270809
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 633", based on the 5-celled von Neumann neighborhood.at n=24A273301
• Partial sums of A033616.at n=33A299902
• Expansion of Product_{i>=1, j>=1, k>=1} 1/(1 - i*j*k*x^(i*j*k)).at n=10A318481
• Expansion of 1/(1 - x) * Product_{k>=0} 1/(1 - x^(3^k))^(3^(k+1)).at n=13A321344