69391domain: NAppears in sequencesE.g.f. exp( 1 - x - sqrt( 1 - 4*x + x^2 )).at n=6A078634Number of binary strings of length n with equal numbers of 00110 and 01001 substrings.at n=17A164251Number of 2 X 2 matrices with all terms in {-n,..,0,..,n} and (sum of terms) = determinant.at n=38A281194