378001domain: NAppears in sequencesExpansion of e.g.f. exp(x/(1 - x^4)).at n=9A293507a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/4)} binomial(n,4*k+1) * a(n-4*k-1).at n=9A352429a(n) = n! * Sum_{k=0..floor(n/4)} (n - 4*k)^k/(n - 4*k)!.at n=9A356630Expansion of e.g.f. Sum_{k>=0} x^k / (k! - k*x^k).at n=9A356668