Number of 4-ascent sequences of length n with no consecutive repeated letters.
A263854
Number of 4-ascent sequences of length n with no consecutive repeated letters.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =20a(4) =110a(5) =670a(6) =4470a(7) =32440a(8) =254490a(9) =2146525a(10) =19374399a(11) =186356108a(12) =1903188611a(13) =20569046543a(14) =234562076984
External references
- oeis: A263854