91101domain: NAppears in sequencesNumber of length 4+3 0..n arrays with some disjoint pairs in every consecutive four terms having the same sum.at n=15A247536Triangle read by rows, T(n,k) = Sum_{j=0..n} (-1)^(n-j)*C(-j-1,-n-1)*S2(k,j), S2 the Stirling set numbers A048993, for n>=0 and 0<=k<=n.at n=52A271702