Number of 2-ascent sequences of length n with no consecutive repeated letters.
A263852
Number of 2-ascent sequences of length n with no consecutive repeated letters.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =87a(6) =413a(7) =2213a(8) =13205a(9) =86828a(10) =623712a(11) =4859307a(12) =40810353a(13) =367525528a(14) =3532986232a(15) =36107260781a(16) =390938180027
External references
- oeis: A263852