Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101.
A259998
Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101.
Terms
- a(0) =1228a(1) =4383a(2) =13562a(3) =23680a(4) =55276a(5) =190794a(6) =450718a(7) =964370a(8) =2768522a(9) =8264691a(10) =20203550a(11) =48957864a(12) =137929046a(13) =406791665a(14) =1033667566a(15) =2555190916a(16) =7196820436a(17) =21161205056a(18) =54066522950a(19) =135615946112a(20) =383740890668
External references
- oeis: A259998