Number of 3 X 3 matrices, with elements from {0,...,n}, having the property that the middle element of each of the eight 3-element horizontal, vertical and diagonal lines equals the average of the two end elements.
A059329
Number of 3 X 3 matrices, with elements from {0,...,n}, having the property that the middle element of each of the eight 3-element horizontal, vertical and diagonal lines equals the average of the two end elements.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =12a(4) =25a(5) =38a(6) =63a(7) =88a(8) =129a(9) =170a(10) =231a(11) =292a(12) =377a(13) =462a(14) =575a(15) =688a(16) =833a(17) =978a(18) =1159a(19) =1340a(20) =1561a(21) =1782a(22) =2047a(23) =2312a(24) =2625a(25) =2938a(26) =3303a(27) =3668a(28) =4089a(29) =4510
External references
- oeis: A059329