27399

Appears in sequences

• Add 1, multiply by 1, add 2, multiply by 2, etc.; start with 0.at n=15A019461
• Number of unlabeled asymmetric ternary cacti having n triangles.at n=9A054422
• a(0) = 1; a(n) = (n-1)*a(n-1) + n.at n=8A111063
• Numbers k such that lcm(1,2,3,...,k)/13 equals the denominator of the k-th harmonic number H(k).at n=25A112818
• Integers n of the form 8k+7 that are sum of distinct squares of the form m, m+1, m+2, m+4, where m == 1 (mod 4).at n=20A243578
• Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock antidiagonal maximum minus diagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal minimum nondecreasing vertically.at n=30A253393
• Array read by antidiagonals: T(n,k) is the number of (planar) unlabeled asymmetric k-ary cacti having n polygons.at n=75A303913
• Triangle read by rows: T(n,k) is the number of n X n binary matrices with k=0..n^2 ones forming a polyomino, under action of dihedral group of the square D_4.at n=48A331462
• A puzzle array read by antidiagonals.at n=42A358349
• Array read by downward antidiagonals: A(n,k) = A(n-1,k+1) + 2*(k+1)!*Sum_{j=0..k} A(n-1,j)/j! with A(0,k) = 1, n >= 0, k >= 0.at n=29A379458