Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northwest or northeast neighbor modulo 3 and the upper left element equal to 0.
A266682
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northwest or northeast neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =2a(1) =5a(2) =15a(3) =59a(4) =257a(5) =1205a(6) =5879a(7) =29693a(8) =153097a(9) =806375a(10) =4307317a(11) =23313947a(12) =127420533a(13) =702562447a(14) =3900415155a(15) =21786817517a(16) =122309555899a(17) =689707853981
External references
- oeis: A266682