login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A264915 Number of 10-ascent sequences of length n with no consecutive repeated letters. 2
1, 1, 10, 110, 1265, 15235, 191785, 2519605, 34494625, 491432590, 7276062838, 111816814439, 1781492191281, 29392907305322, 501677394880530, 8849027884862077, 161155012811798819, 3027460412190175918, 58617635130507630386, 1168800382939975874066 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..200

S. Kitaev, J. Remmel, p-Ascent Sequences, arXiv:1503.00914 [math.CO], 2015.

MAPLE

b:= proc(n, i, t) option remember; `if`(n<1, 1, add(

      `if`(j=i, 0, b(n-1, j, t+`if`(j>i, 1, 0))), j=0..t+10))

    end:

a:= n-> (b(n-1, 0$2)):

seq(a(n), n=0..30);

MATHEMATICA

b[n_, i_, t_] := b[n, i, t] = If[n < 1, 1, Sum[If[j == i, 0, b[n - 1, j, t + If[j > i, 1, 0]]], {j, 0, t + 10}]]; a[n_] :=  b[n - 1, 0, 0];

Table[a[n], {n, 0, 30}] (* Jean-Fran├žois Alcover, Nov 09 2017, after Alois P. Heinz *)

CROSSREFS

Column k=10 of A264909.

Sequence in context: A289967 A057093 A055276 * A289414 A143749 A276507

Adjacent sequences:  A264912 A264913 A264914 * A264916 A264917 A264918

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 28 2015

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 16 15:51 EDT 2019. Contains 328101 sequences. (Running on oeis4.)