19579

Appears in sequences

• Number of labeled rooted trimmed trees with n nodes.at n=6A052318
• Triangle T, read by rows, where the g.f. of column k in matrix power T^m is given by: 1/(1-x)^m = Sum_{n>=k} [T^m](n,k) * x^(n-k)/(1+x)^{n(n-1)/2 - k(k-1)/2} for k>=0.at n=48A141760
• Column 3 of triangle A141760.at n=6A141763
• Numbers n with property that n^2 is a concatenation of three 3-digit primes.at n=32A153139
• Number of ordered triples (i,j,k) with |i|, |j|, |k|, |i*j*k| <= n.at n=37A226359
• Number of partitions of n containing m(4) as a part, where m denotes multiplicity.at n=42A240489
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 3 5 6 or 7.at n=15A252247
• Triangular array read by rows. T(n,k) is the number of rooted labeled trees on n nodes with exactly k vertices whose unique descendent is a leaf, n >= 1, 0 <= k <= floor((n-1)/2) + delta_{2,n}.at n=13A284417