27853

Appears in sequences

• Number of directed animals on a certain lattice.at n=6A011789
• Numbers k such that A003313(k) = A003313(5*k).at n=9A116460
• a(n) = n*(7*n^2 - 3*n - 1)/3.at n=23A214659
• Number of squares of all sizes in polyominoes obtained by union of two pyramidal figures (A092498) with intersection equals A002623.at n=42A260918
• Irregular triangle read by rows: row n gives numbers of maximal chains of lengths n-1, n, n+1, ... in the Tamari lattice T_n.at n=35A282698