1/4 the number of (n+1)X7 0..2 arrays with every 2X2 subblock having distinct edge sums.
A209380
1/4 the number of (n+1)X7 0..2 arrays with every 2X2 subblock having distinct edge sums.
Terms
- a(0) =128a(1) =410a(2) =840a(3) =4004a(4) =8648a(5) =52784a(6) =114056a(7) =790712a(8) =1693448a(9) =12487208a(10) =26563080a(11) =201742280a(12) =427484168a(13) =3292956296a(14) =6963468296a(15) =54006743816a(16) =114088980488a(17) =887752094216
External references
- oeis: A209380