91482domain: NAppears in sequencesHalf the number of 0..5 arrays of length n+2 with second differences nonzero.at n=4A212779T(n,k)=Half the number of 0..k arrays of length n+2 with second differences nonzero.at n=40A212782Half the number of 0..n arrays of length 7 with second differences nonzero.at n=4A212786