27880

Appears in sequences

• Number of asymmetric mobiles (cycle rooted trees) with n nodes and 2-colored internal (non-leaf) nodes.at n=9A108532
• a(n) = 4*(4 + 9*n^2 + 15*n).at n=27A144449
• Terms of A061039 that are multiple of 10, in the order in which they appear.at n=33A146762
• a(n) = 17*n*(n+1).at n=40A173308
• Number of (n+2)X3 binary arrays avoiding patterns 000 and 010 in rows and columns.at n=4A202399
• Number of (n+2) X 7 binary arrays avoiding patterns 000 and 010 in rows and columns.at n=0A202403
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 000 and 010 in rows and columns.at n=10A202406
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 000 and 010 in rows and columns.at n=14A202406
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 0 vertically.at n=42A208078
• Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 0 vertically.at n=2A208082
• Primitive triangle numbers as defined in A218243.at n=40A218392
• Number of (n+2) X (1+2) 0..2 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 or 4.at n=8A252336
• T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 or 4.at n=36A252343
• The total number of different isosceles trapezoids, excluding squares, that can be drawn on an n X n square grid where the corners of each individual trapezoid lie on a lattice point.at n=40A272459
• Denominators of (1/8)*n*(5 + 3*n)/((1 + 3*n)*(4 + 3*n)), n >= 0.at n=27A300297
• Triangle read by rows: T(n,k) is the number of unlabeled weakly graded (ranked) posets with n elements and rank k.at n=48A361953