18350080

Appears in sequences

• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*10^j.at n=29A038288
• Triangle T, read by rows, where matrix power T^-2 has -2^(n+1) in the secondary diagonal: [T^-2](n+1,n) = -2^(n+1), with all 1's in the main diagonal and zeros elsewhere.at n=40A117265
• Triangle, read by rows, T(n, k) = (-1)^k * (n-k+1)^(n+2) * binomial(n+1, k).at n=32A176860
• Smallest number of the form 11*m+1 with exactly n prime factors, counted with multiplicity.at n=21A230123
• Number of symmetry classes of 3-eared triangulations of an n-gon.at n=20A232492
• Lexicographically earliest sequence such that (i) the binary plot of the sequence is symmetric with respect to the line y=x and (ii) the derived sequence (A000265(a(n))) contains only distinct terms.at n=20A240972
• Triangular array read by rows. T(n,k) is the number of labeled trees with black and white nodes having exactly k black nodes, n>=0, 0<=k<=n.at n=40A249632
• Number of 3-cycles in the n-halved cube graph.at n=15A290026
• Number of subsets of {1..n} that contain exactly three odd numbers.at n=30A331408