Number of (n+1) X (1+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge or main diagonally.
A251285
Number of (n+1) X (1+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge or main diagonally.
Terms
- a(0) =9a(1) =22a(2) =52a(3) =125a(4) =297a(5) =710a(6) =1691a(7) =4036a(8) =9621a(9) =22951a(10) =54727a(11) =130529a(12) =311280a(13) =742388a(14) =1770476a(15) =4222417a(16) =10069902a(17) =24015598a(18) =57274225a(19) =136592357a(20) =325756272a(21) =776890181a(22) =1852790060a(23) =4418684023a(24) =10538033895a(25) =25131955837a(26) =59936717455
External references
- oeis: A251285