49920

Appears in sequences

• a(n) = 2*(a(n-1) + a(n-2)), a(0) = 0, a(1) = 1.at n=12A002605
• Restricted permutations.at n=9A002777
• a(n) = sigma(sigma(...(sigma(n))...)) / n, where sigma (A000203) is iterated until a multiple of n is reached.at n=21A019295
• Saint-Exupéry numbers: ordered products of the three sides of Pythagorean triangles.at n=20A057096
• Jordan function J_4(n).at n=14A059377
• Numbers expressible as (a^2-1)(b^2-1) in at least 2 distinct ways (b>=a>1).at n=29A063067
• Triangle of Gandhi polynomial coefficients.at n=33A065748
• Integers k such that k*28*c + 1 is prime for c = 1, 2, 4, 7 and 14.at n=19A067199
• G.f.: Product_{m>=1} 1/(1-x^m)^64.at n=3A082559
• Location of records in A099564.at n=15A099565
• Numbers that can be written as (a^2-1)(b^2-1) in three or more distinct ways.at n=3A134856
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 9.at n=26A136905
• Symmetrical Hahn weights on q-form factorials:m=3;q=4; q-form:t(n,m)=If[m == 0, n!, Product[Sum[(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]]; Hahn weight:b(n,k,m)=If[n == 0, 1, (n!*t[m + 1, k]*t[m + 1, n - k])/(k!*(n - k)!*t[1, n])].at n=5A157322
• Symmetrical Hahn weights on q-form factorials:m=3;q=4; q-form:t(n,m)=If[m == 0, n!, Product[Sum[(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]]; Hahn weight:b(n,k,m)=If[n == 0, 1, (n!*t[m + 1, k]*t[m + 1, n - k])/(k!*(n - k)!*t[1, n])].at n=3A157322
• a(n) = [x^n] 1/eta(x)^(4^n).at n=3A158104
• Number of edge colorings of the Petersen graph.at n=4A159233
• Expansion of g.f.: x^2*(1 + x - x^2)/(1 - 2*x^2 - 2*x^4).at n=24A160444
• Elements of A160444, pairs of consecutive entries swapped.at n=25A160572
• Jordan function J_{-4} multiplied by n^4.at n=14A189922
• Sum of the divisors of n^3 - 1.at n=23A234860