223498

Appears in sequences

• Poincaré series [or Poincare series] P(T_{4,2}; x).at n=15A124616
• Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (9,n)-rectangular grid with k '1's and (9n-k) '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=37A228168
• Number of length-2n binary strings of the form xxyy.at n=13A347582