27568

Appears in sequences

• "BFK" (reversible, size, unlabeled) transform of 2,1,1,1...at n=29A032044
• Diagonal sums of number array A082105.at n=15A082107
• Numbers equal to a permutation (or rearrangement) of the digits of the sum of their proper divisors. Rearrangements which cause leading zeros are excluded.at n=25A085844
• Triangle read by rows: T(n,1) = 1, T(n,k) = T(n-1,k)+(n-1)*T(n-1,k-1) for 1<=k<=n+1.at n=49A096747
• Numbers n such that the sum of the digits of Sum_{k=1..n} (k!) is divisible by n.at n=22A109657
• Triangle read by rows: T(n,1)=1, T(n,k) = T(n-1,k) + (n-1)T(n-1, k-1) for 1 <= k <= n.at n=40A109822
• a(n) = 2*a(n-1) + 10*a(n-2), with a(0) = 2 and a(1) = 2.at n=7A127261
• a(n) = floor(1/{(10+n^4)^(1/4)}), where {}=fractional part.at n=40A184634
• Triangle, read by rows, that transforms diagonals in the table of coefficients in the successive iterations of the g.f. (A233531) such that column 0 consists of all zeros after row 1.at n=38A233530
• Third column of triangle A233530.at n=6A233533
• a(n) is the sum of lattice points enumerated by the square number spiral falling on the circumference of circles centered at the origin of radii n.at n=29A309573
• E.g.f.: S(x,q) = Integral C(x,q) * C(q*x,q) dx, such that C(x,q)^2 - S(x,q)^2 = 1, where S(x,q) = Sum_{n>=0} sum_{k=0..n*(n+1)/2} T(n,k)*x^n*y^k/n!, as an irregular triangle of coefficients T(n,k) read by rows.at n=33A322219
• Number T(n,k) of entries in the k-th cycles of all permutations of [n] when cycles are ordered by decreasing lengths (and increasing smallest elements); triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=40A322384
• Number of entries in the fifth cycles of all permutations of [n] when cycles are ordered by decreasing lengths.at n=4A332854
• Triangle read by rows. Coefficients of the polynomials H(n, x) = Sum_{k=0..n-1} Sum_{i=0..k} abs(Stirling1(n, n - i)) * x^(n - k) in ascending order of powers.at n=50A358694
• Expansion of e.g.f. (1/x) * Series_Reversion( x * exp(-2*x)/(1 + x)^2 ).at n=4A380646