19620

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 14.at n=20A031692
• Number of 3 X 3 stochastic matrices under row and column permutations.at n=47A052282
• a(n) = sigma_3(n) - sigma_2(n).at n=26A092349
• a(n) = A007318 * [1, 6, 14, 9, 0, 0, 0, ...].at n=23A143690
• a(n) = 196*n^2 + 2*n.at n=9A158222
• a(n) = 400*n^2 + 20.at n=7A158601
• a(n) = 49*n^2 + n.at n=19A173141
• Number of distinct sums <= 1 of reciprocals of positive integers <= n.at n=15A212606
• Triangle T(n, k) = Number of ways to choose k points from an n X n X n triangular grid so that no three of them form a 2 X 2 X 2 subtriangle. Triangle T read by rows.at n=48A234251
• Number of ways to choose 4 points in an n X n X n triangular grid so that no 3 of them form a 2 X 2 X 2 subtriangle.at n=4A237529
• G.f.: Sum_{n>=0} n^n * x^n * (1 + n*x)^n / (1 + n*x + n^2*x^2)^(n+1).at n=6A240921
• Number of exact 3-colored partitions such that no adjacent parts have the same color.at n=12A262445
• Number of nXnXn triangular 0..5 arrays with new values introduced in sequential zero-upwards order and exactly one upright 2x2x2 triangle having values all equal.at n=3A271337
• T(n,k)=Number of nXnXn triangular 0..k arrays with new values introduced in sequential zero-upwards order and exactly one upright 2x2x2 triangle having values all equal.at n=31A271339
• Number of horizontal segments of length 1 in all bargraphs of semiperimeter n (n>=2). By a horizontal segment of length 1 we mean a horizontal step that is not adjacent to any other horizontal step.at n=9A274492
• The difference between A089580(n) and A089579(n).at n=16A275358
• Triangle read by rows, derived from A007318, row sums = the Bell Sequence.at n=52A309495
• Number of ways to write n as an ordered sum of 10 squares of positive integers.at n=46A340947
• On a spirally numbered square grid, with labels starting at 1, this is the number of steps that an (n,n+1) leaper makes before getting trapped, or -1 if it never gets trapped.at n=16A343178
• a(n) = Sum_{k=0..n} binomial(8*k,k) / (7*k + 1).at n=5A346672