Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010001.
A260203
Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010001.
Terms
- a(0) =220a(1) =479a(2) =1857a(3) =5998a(4) =20408a(5) =71846a(6) =245486a(7) =841296a(8) =2905978a(9) =9992478a(10) =34348500a(11) =118254574a(12) =406871094a(13) =1399624310a(14) =4816056622a(15) =16570641810a(16) =57011471540a(17) =196158495144a(18) =674916008534
External references
- oeis: A260203