799488domain: NAppears in sequencesE.g.f.: x/(1-sinh(x)).at n=9A109570Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7.at n=21A252108