88510464domain: NAppears in sequencesNumber of (n+1)X(2+1) 0..2 arrays with nondecreasing sum of every two consecutive values in every row and column.at n=10A250437a(n) = Product_{d|n} lcm(d, sigma(d)) where sigma(k) is the sum of divisors of k (A000203).at n=27A334805