Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101.
A259997
Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101.
Terms
- a(0) =641a(1) =1819a(2) =6157a(3) =12620a(4) =23680a(5) =74850a(6) =197804a(7) =383548a(8) =942638a(9) =2727852a(10) =6128454a(11) =13250442a(12) =35951522a(13) =91093240a(14) =199168800a(15) =485362526a(16) =1276770070a(17) =2989412528a(18) =6882229004a(19) =17541213370a(20) =43445183724a(21) =100482691170a(22) =244053647200
External references
- oeis: A259997