Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.
A186872
Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.
Terms
- a(0) =262144a(1) =421a(2) =6712a(3) =79096a(4) =214264a(5) =287368a(6) =443560a(7) =801208a(8) =1845448a(9) =6154456a(10) =19253080a(11) =52715464a(12) =160802104a(13) =443095912a(14) =1131273304a(15) =3286379416a(16) =9131561848a(17) =24052744744a(18) =69820713688a(19) =195342687640a(20) =520410211576
External references
- oeis: A186872