Number of nX4 0..1 arrays with every element unequal to 0, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.
A304672
Number of nX4 0..1 arrays with every element unequal to 0, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =13a(2) =23a(3) =56a(4) =199a(5) =598a(6) =1950a(7) =6588a(8) =21871a(9) =72947a(10) =246313a(11) =831539a(12) =2800595a(13) =9456853a(14) =31947922a(15) =107896991a(16) =364471611a(17) =1231447079a(18) =4160781508a(19) =14058449969a(20) =47502997786a(21) =160513512708a(22) =542381014412
External references
- oeis: A304672