Number of nX3 0..1 arrays with every element unequal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318040
Number of nX3 0..1 arrays with every element unequal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =21a(4) =86a(5) =377a(6) =1648a(7) =7261a(8) =31969a(9) =140758a(10) =619822a(11) =2729394a(12) =12018832a(13) =52924798a(14) =233054021a(15) =1026252071a(16) =4519095292a(17) =19899811452a(18) =87628711701a(19) =385872557006
External references
- oeis: A318040