27820

Appears in sequences

• Number of compositions (ordered partitions) of n into distinct odd parts.at n=56A032021
• Numbers k such that phi(4k-1) = sigma(k).at n=7A067235
• Structured snub dodecahedral numbers.at n=11A100151
• n*(n+1)*(15*n^2-n-8)/12.at n=12A172047
• Number of (n+1) X 5 0..1 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively.at n=15A204647
• Number of length n+1 0..3 arrays with at most one downstep in every n consecutive neighbor pairs.at n=9A258731
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 758", based on the 5-celled von Neumann neighborhood.at n=35A273490
• a(n) is the greatest integer k such that k/Fibonacci(n) < 3/5.at n=24A293642
• a(n)/A002939(n+1) is the Kirchhoff index of the join of the disjoint union of two complete graphs on n vertices with the empty graph on n+1 vertices.at n=11A338109
• Number T(n,k) of sets of n words of length n over binary alphabet where the first letter occurs k times; triangle T(n,k), n>=0, n-signum(n)<=k<=n*(n-1)+signum(n), read by rows.at n=30A360693
• Number T(n,k) of sets of n words of length n over binary alphabet where the first letter occurs k times; triangle T(n,k), n>=0, n-signum(n)<=k<=n*(n-1)+signum(n), read by rows.at n=33A360693