27468

Appears in sequences

• Numbers k such that phi(k) = bigomega(k)*tau(k)^2.at n=32A068540
• Triangle T read by rows: T(m,n) = number of convex polyominoes with an m+1 X n+1 minimal bounding rectangle, m > 0, n <= m.at n=17A093118
• a(n) = (n+1)*(n+2)^2*(n+3)^2*(n+4)*(3n^2 + 15n + 20)/2880.at n=6A107891
• Triangle read by rows, giving Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).at n=48A123353
• Number of fixed 7-dimensional polycubes with n cells.at n=4A151833
• G.f. satisfies A(x)/A(x^2) = (1 + 9x + 9x^2 + 9x^3 + ...).at n=17A176201
• Smith numbers of order 3.at n=6A178213
• Numbers k such that sopfr(k + omega(k)) = sopfr(k), where sopfr(i) = A001414(i) and omega(i) = A001221(i).at n=25A187878
• Expansion of 1/(1 - x - x^2 + x^5 - x^7).at n=24A204631
• The number of convex polyominoes whose smallest bounding rectangle has size w*h (w > 0, h > 0). The table is read by antidiagonals.at n=48A324009
• The number of convex polyominoes whose smallest bounding rectangle has size w*h (w > 0, h > 0). The table is read by antidiagonals.at n=51A324009
• Square array read by descending antidiagonals: A(n,k) is the number of fixed n-dimensional polyominoes of size k.at n=61A385291