179424

Appears in sequences

• Expansion of e.g.f. cos(arcsin(x)*log(x+1))=1-12/4!*x^4+60/5!*x^5-450/6!*x^6+2940/7!*x^7...at n=9A012308
• f-triperfect numbers, where f(n) = sigma(n) and f-triperfect numbers are defined similarly to f-perfect numbers in A066218.at n=2A066731
• Numbers k such that sigma(k) divides Sum_{d|k} sigma(d).at n=8A221219
• a(n) = (n^4 + 2*n^3 - n^2)/2.at n=24A255499
• Square array A(n,k) (n>=1, k>=1) read by antidiagonals: A(n,k) is the number of n-colorings of the prism graph Y_k on 2k vertices.at n=63A277443
• Number of 2 X 2 matrices with all elements in {0,...,n} and prime determinant.at n=42A281315