Number of nX4 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317769
Number of nX4 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =5a(1) =7a(2) =11a(3) =10a(4) =14a(5) =23a(6) =32a(7) =55a(8) =86a(9) =143a(10) =226a(11) =367a(12) =599a(13) =967a(14) =1581a(15) =2574a(16) =4220a(17) =6868a(18) =11207a(19) =18264a(20) =29787a(21) =48612a(22) =79373a(23) =129646a(24) =211599a(25) =345398a(26) =563683a(27) =919995a(28) =1501558a(29) =2451270
External references
- oeis: A317769