1/4 the number of (n+1) X 4 0..2 arrays with every 2 X 2 subblock having distinct edge sums.
A209377
1/4 the number of (n+1) X 4 0..2 arrays with every 2 X 2 subblock having distinct edge sums.
Terms
- a(0) =16a(1) =34a(2) =64a(3) =156a(4) =320a(5) =840a(6) =1792a(7) =4848a(8) =10496a(9) =28704a(10) =62464a(11) =171456a(12) =373760a(13) =1027200a(14) =2240512a(15) =6160128a(16) =13438976a(17) =36954624a(18) =80625664a(19) =221715456a(20) =483737600a(21) =1330268160a(22) =2902392832a(23) =7981559808a(24) =17414291456a(25) =47889260544a(26) =104485617664
External references
- oeis: A209377