89618
domain: N
Appears in sequences
- Row sums of triangle A109282.at n=7A109286
- Number of (n+1)X(n+1) 0..2 arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.at n=2A187459
- T(n,k)=Number of (n+1)X(n+1) 0..k arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.at n=8A187462
- Number of 4X4 0..n arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.at n=1A187464