428400

Appears in sequences

• E.g.f. 1/(1-x-2*x^2).at n=7A052585
• Expansion of e.g.f. (1-x)^2/(1-4*x+3*x^2-x^3).at n=6A052696
• Jordan function J_4(n).at n=25A059377
• A level 11 weight 5 form.at n=25A065103
• A Jacobsthal number related number triangle.at n=28A110321
• a(n) = 31250*n - 9100.at n=13A157622
• Triangle T(n, k, q) = c(n,q)/( c(k,q)*c(n-k,q) ), where c(n, q) = Product_{j=1..n} f(n, q), f(n, q) = ( (1-q^n)*(1+(-1)^n) + n!*(1-(-1)^n) )/2, and q = 2, read by rows.at n=38A172427
• Triangle T(n, k, q) = c(n,q)/( c(k,q)*c(n-k,q) ), where c(n, q) = Product_{j=1..n} f(n, q), f(n, q) = ( (1-q^n)*(1+(-1)^n) + n!*(1-(-1)^n) )/2, and q = 2, read by rows.at n=42A172427
• Jordan function J_{-4} multiplied by n^4.at n=25A189922
• The Wiener index of a link of n fullerenes C_{20} (see the Ghorbani and Hosseinzadeh reference).at n=11A216114
• Positive numbers differing from next 3 greater squares by squares.at n=18A218487
• Highly composite numbers of class 4 (see comment in A275239).at n=31A275242
• Numbers m such that A049417(A049417(m)) = k*m for some k where A049417 is the infinitary sigma function.at n=26A318182
• a(n) = (n - 1)! * sigma_2(n), where sigma_2(n) = sum of squares of divisors of n (A001157).at n=7A318250
• Irregular triangle read by rows: T(n,k) is the number of arrangements of n labeled children with exactly k rounds; n >= 2, 1 <= k <= floor(n/2).at n=23A349280
• Table read by rows: T(n, k) = A124320(n + 1, k) * A132393(n, k).at n=25A368583