Number of 3X3 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal.
A187706
Number of 3X3 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal.
Terms
- a(0) =128a(1) =1489a(2) =8272a(3) =31461a(4) =93476a(5) =235773a(6) =524284a(7) =1062857a(8) =1999212a(9) =3541677a(10) =5967404a(11) =9648841a(12) =15048584a(13) =22766353a(14) =33534080a(15) =48248321a(16) =67983232a(17) =94042589a(18) =127929948a(19) =171449249a(20) =226655576a(21) =295941137a(22) =382036240a(23) =488090685a(24) =617595596a(25) =774557293
External references
- oeis: A187706