2131200domain: NAppears in sequencesTheta series of laminated lattice LAMBDA_14.at n=7A023937a(n) is the number of sets of natural numbers [a,b,c,d,e] that can be produced with the numbers [0..n] such that the values of all the distinct parenthesized expressions of a-b-c-d-e are different.at n=19A054026