80070

Appears in sequences

• Number of rooted unlabeled trees on n nodes having a primary branch.at n=14A027415
• Number of connected functions on n points with a loop of length 2.at n=14A027852
• a(n) = (122n^3 + 140n^2 + 45n + 3n(-1)^n)/8.at n=17A191698
• Number of n X 3 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically.at n=6A206989
• Number of nX7 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically.at n=2A206993
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically.at n=38A206994
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically.at n=42A206994
• Number of rooted unlabeled trees where the root node has degree 2 and both branches are distinct.at n=15A217420
• Number of nontrivial prime powers p^k (k>1) less than 10^n.at n=11A267574