885032domain: NAppears in sequencesTriangle T(n,k) read by rows given by [0, 1, 3, 6, 10, 15, 21, ...] DELTA [1, 3, 6, 10, 15, 21, 28,...] where DELTA is the operator defined in A084938.at n=26A087736Number of length n binary sequences with at most 2 of every adjacent 6 bits set.at n=30A133523