Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or northwest neighbor modulo 3 and the upper left element equal to 0.
A266833
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or northwest neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =18a(5) =64a(6) =200a(7) =608a(8) =1892a(9) =6003a(10) =19569a(11) =64801a(12) =214944a(13) =712344a(14) =2360429a(15) =7831744a(16) =26066842a(17) =87077489a(18) =291778301a(19) =979938877a(20) =3296756218a(21) =11106812985a(22) =37470837895a(23) =126595907915a(24) =428321817846
External references
- oeis: A266833