332669domain: NAppears in sequencesNumber of n X 7 arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 n X 7 array.at n=21A220031a(n) = Sum_{k=0..n} (k!)^k * binomial(n,k).at n=4A343899