18093

Appears in sequences

• Feynman diagrams of order 2n with vertex skeletons.at n=5A005414
• a(n) + a(n+1) + a(n+2) = n^5, with a(1) = a(2) = 0.at n=9A152730
• 3 times 11-gonal (or hendecagonal) numbers: a(n) = 3*n*(9*n-7)/2.at n=37A153783
• The Wiener index of the graph obtained by applying Mycielski's construction to the crown graph G(n) (n>=3).at n=34A228598
• Number of nX3 0..1 arrays with every element equal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=11A300375
• Number of nX3 0..1 arrays with every element equal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=11A300677
• Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=6A302317
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=42A302322
• Number of 7Xn 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=2A302328
• Nonprime numbers k of the form 4*m+1 such that Sum_{j=0..k-1} 2^j * binomial(3*j, j) == 1 (mod k).at n=27A373747