287280

Appears in sequences

• 2nd differences of factorial numbers.at n=7A001564
• A triangle of numbers related to triangle A030526.at n=23A049353
• Triangle T[n,m]: T[n,-1] = 0; T[0,0] = 0; T[n,0] = n*n!; T[n,m] = T[n,m-1] - T[n-1,m-1].at n=37A061312
• Euler's difference table: triangle read by rows, formed by starting with factorial numbers (A000142) and repeatedly taking differences. T(n,n) = n!, T(n,k) = T(n,k+1) - T(n-1,k).at n=52A068106
• A square array of quadratic-factorial numbers, read by antidiagonals.at n=43A082038
• Sum of the non-unitary divisors of A064115(n) (or of 1+A064115(n)).at n=14A103846
• First differences of the rows in the triangle of A116853, starting with 0.at n=52A116854
• Number of permutations of length n within distance 7.at n=9A154656
• Numbers which are the area of exactly three Pythagorean triangles.at n=27A177021
• Number of n X 4 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=28A208065
• Number of acyclic orientations of the Turán graph T(n,7).at n=9A267387
• Highly composite numbers of class 5 (see comment in A275239).at n=29A275243
• Number of permutations of [n] such that for each cycle c the smallest integer interval containing all elements of c has at most seven elements.at n=10A276841
• Eighth column of Euler's difference table in A068106.at n=8A284204
• Coefficients in expansion of -q*E'_6/E_6 where E_6 is the Eisenstein Series (A013973).at n=1A289637
• Larger of semi-unitary amicable numbers pair: numbers (m, n) such that susigma(m) = susigma(n) = m + n, where susigma(n) is the sum of the semi-unitary divisors of n (A322485).at n=24A322542
• Table read by ascending antidiagonals: T(n, k) is the maximum number of quasi k-gons that are not k-gons in a finite projective plane of order n, with k >= 3.at n=7A342307
• a(n) = 2*(4*n+1)!/(3*n+2)!.at n=5A370056
• Positive integers k such that the set {d+k/d : d|k} contains three consecutive integers.at n=31A386302