Number of (n+1)X(n+1) 0..4 arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.
A187461
Number of (n+1)X(n+1) 0..4 arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.
Terms
- a(0) =512a(1) =84048a(2) =100936174a(3) =216668424092
External references
- oeis: A187461