Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum or central row sum less than the central column sum.
A257355
Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum or central row sum less than the central column sum.
Terms
- a(0) =784a(1) =2116a(2) =6724a(3) =20449a(4) =53824a(5) =145924a(6) =451584a(7) =1368900a(8) =3724900a(9) =10240000a(10) =30603024a(11) =90897156a(12) =253892356a(13) =710862244a(14) =2085383556a(15) =6110861584a(16) =17291198016a(17) =48919707684a(18) =142124476036a(19) =413163557284
External references
- oeis: A257355