Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.
A260102
Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.
Terms
- a(0) =472a(1) =1151a(2) =2768a(3) =7119a(4) =18209a(5) =47498a(6) =121800a(7) =316688a(8) =816233a(9) =2113881a(10) =5460501a(11) =14120119a(12) =36498979a(13) =94341890a(14) =243940644a(15) =630594281a(16) =1630241143a(17) =4214482154a(18) =10894955883a(19) =28166443182a(20) =72813856778a(21) =188242874515a(22) =486636771766
External references
- oeis: A260102