1546353domain: NAppears in sequencesNumber of -4..4 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous.at n=11A199843a(0)=0; for n > 0, a(n) = a(n-1)*n + n if n is odd, (a(n-1) + n)*n otherwise.at n=9A344496