174397531domain: NAppears in sequencesa(n) = 24*5^n - 60*4^n + 50*3^n - 15*2^n + 1.at n=10A091348Number of permutations of 1..n with i-9<=p(i)<=i+4.at n=13A179357E.g.f.: Sum_{n>=1} (1 - exp(-n^2*x))^n / n.at n=4A220179