24570

Appears in sequences

• Area of more than one Pythagorean triangle.at n=20A009127
• a(n) = floor(n(n-1)(n-2)(n-3)/20).at n=28A011930
• Matrix square of Stirling2 triangle A008277: 2-levels set partitions of [n] into k first-level subsets.at n=41A039810
• Triangle of generalized Stirling numbers of 2nd kind.at n=39A046817
• Expansion of e.g.f.: (1-x)^(-x/2)*exp(-x^2*(4 +2*x +x^2)/8).at n=9A053531
• Start with a single triangle; at n-th generation add a triangle at each vertex, allowing triangles to overlap; sequence gives number of triangles in n-th generation.at n=24A061776
• 4th level triangle related to Eulerian numbers and binomial transforms (A062254 is third level, A062253 is second level, triangle of Eulerian numbers is first level and triangle with Z(0,0)=1 and Z(n,k)=0 otherwise is 0th level).at n=17A062255
• First differences of A066425.at n=13A068054
• a(1) = 1; thereafter a(n) = 6*(2^(n-1) - 1).at n=12A068293
• Triangle T(n,k) defined by Sum_{k=1..n} T(n,k)*u^k*t^n/n! = ((1+t)*(1+t^2)*(1+t^3)...)^u.at n=51A075525
• Even numbers k such that the central binomial coefficient A000984(k, k/2) is divisible by k^2.at n=12A080395
• Numbers n which when converted to base 8, reversed and converted back to base 10 yield a number m such that n mod m = 0. Cases which are trivial or result in digit loss are excluded.at n=9A091082
• Excess of n + product of digits over next prime associated with A091628.at n=12A091632
• Least sum (n+1) + (n+2) + ... + (n+k) that is a multiple of the n-th triangular number, n(n+1)/2.at n=34A110351
• n+p(n)+p(p(n)) is a palindrome, where p(n) denotes the n-th prime.at n=39A116037
• Primitive elements of A096490.at n=16A118671
• Number of permutations of n distinct letters (ABCD...) each of which appears thrice with n-3 fixed points.at n=14A124007
• Square of the Stirling2 matrix A048993.at n=51A130191
• Weight distribution of [63,36,11] primitive binary BCH code.at n=12A151770
• First differences of A158916.at n=14A158926