Number of nX4 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.
A301537
Number of nX4 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.
Terms
- a(0) =5a(1) =10a(2) =26a(3) =79a(4) =212a(5) =603a(6) =1841a(7) =5663a(8) =17379a(9) =53565a(10) =166423a(11) =518704a(12) =1616890a(13) =5041039a(14) =15729206a(15) =49104949a(16) =153322792a(17) =478742546a(18) =1494954997a(19) =4668557664a(20) =14579783689a(21) =45532767521a(22) =142200230227a(23) =444098944427
External references
- oeis: A301537