509132

Appears in sequences

• Number of binary strings of length n which have the same number of 00 and 01 substrings.at n=22A163493
• The number of binary pattern classes in the (2,n)-rectangular grid with 7 '1's and (2n-7) '0's: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.at n=15A228582