29380

Appears in sequences

• Number of discordant permutations.at n=3A000565
• Number of permutations of [n] with no 3-term arithmetic progression.at n=14A003407
• Numbers k that divide 4^k + 4.at n=18A015889
• Triangle read by rows: T(n,k) is the number of k-matchings in the C_n X P_2 graph (C_n is the cycle graph on n vertices and P_2 is the path graph on 2 vertices).at n=59A102079
• Triangle, read by rows, where T(n,k) = T(n,k-1) + n*T(n-1,k-1) for n>0 and k>0, with T(n,0) = T(n-1,n-1) for n>0 and T(0,0) = 1.at n=25A132007
• Triangle, read by rows, equal to the matrix cube of triangle P = A135880.at n=22A135888
• Column 1 of triangle A135888, which equals the matrix cube of triangle A135880; also equals column 1 of triangle A135895.at n=5A135890
• Triangle, read by rows, equal to R^2, the matrix square of R = A135894.at n=22A135895
• a(n) = 2*n^3 - 3*n^2 + 5.at n=25A152064
• Number of (n+1)X(2+1) 0..2 arrays with no element greater than all horizontal neighbors or equal to all vertical neighbors.at n=4A239172
• T(n,k) = number of (n+1) X (k+1) 0..2 arrays with no element greater than all horizontal neighbors or equal to all vertical neighbors.at n=19A239178
• Number of (5+1)X(n+1) 0..2 arrays with no element greater than all horizontal neighbors or equal to all vertical neighbors.at n=1A239183
• Number of compositions of n such that the smallest part has multiplicity nine.at n=11A241869
• Practical numbers z such that z^2 = x^2 + y^2 for some practical numbers x and y with gcd(x,y,z) = 4.at n=39A294112
• Triangle T(n,k) of the numbers of k-matchings in the n-Moebius ladder (0 <= k <= n, n > 2).at n=56A302232
• Expansion of (1/x) * Series_Reversion( x * (1-x-x^2)^4 ).at n=5A376326