149053domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of nX7 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.at n=8A223769a(n) = Sum_{k=1..n} C(n-1,k-1) * S2(n,k) * 2^(n-k) for n>0, a(0)=1, where S2(n,k) = A048993(n,k) are Stirling numbers of the 2nd kind.at n=7A245059Prime numbersat n=13762