Number of (n+2)X4 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly one way, and new values 0..1 introduced in row major order.
A204355
Number of (n+2)X4 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly one way, and new values 0..1 introduced in row major order.
Terms
- a(0) =241a(1) =713a(2) =2063a(3) =5812a(4) =16792a(5) =48226a(6) =137407a(7) =391892a(8) =1119476a(9) =3196951a(10) =9126981a(11) =26061757a(12) =74425495a(13) =212515956a(14) =606804945a(15) =1732733907a(16) =4947863676a(17) =14128324624a(18) =40342604370a(19) =115197578608a(20) =328943960511a(21) =939285398798
External references
- oeis: A204355