Number of 3 X n arrays containing n copies of 0..3-1 with no element 1 greater than its west, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.
A267164
Number of 3 X n arrays containing n copies of 0..3-1 with no element 1 greater than its west, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =2a(1) =0a(2) =1a(3) =15a(4) =65a(5) =202a(6) =537a(7) =1559a(8) =6506a(9) =27557a(10) =104122a(11) =360598a(12) =1236670a(13) =4479897a(14) =16998081a(15) =64623235a(16) =240399786a(17) =880495525a(18) =3233751496a(19) =12035510317a(20) =45240963675a(21) =170207777737a(22) =637838570111
External references
- oeis: A267164