Number of ascent sequences of length n avoiding the pattern 0000.
A317784
Number of ascent sequences of length n avoiding the pattern 0000.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =47a(6) =180a(7) =773a(8) =3701a(9) =19488a(10) =111890a(11) =695786a(12) =4656185a(13) =33356828a(14) =254675642a(15) =2063984616a(16) =17694054723a(17) =159958176316
External references
- oeis: A317784