32092959domain: NAppears in sequencesa(n) = T(2*n, n), array T as in A047080.at n=16A047085For two strings of length n, this is the number of pairwise alignments that do not have an insertion adjacent to a deletion. (Duplicate of A047085.)at n=16A171155Number of symmetric bargraphs having semiperimeter n (n>=2).at n=30A273905