A128094 - cp's OEIS frontend

A128094 Number of sequences s of length n, with s[1]=1, s[2]=1, s[3]=1, s[k-1] <=s[k] <= s[k-1]+s[k-2]+s[k-3] (s is called a sub-tribonacci sequence of length n).

n	a(n)
3	1
4	3
5	9
6	36
7	228
8	2196
9	33901
10	862503
11	36346723
12	2564238411
13	304902857694
14	61384367733677
15	21020435566780278
16	12292402317454051941
17	12319906894146608845054
18	21234027294331775378957366

[1, 3, 9, 36, 228, 2196, 33901, 862503, 36346723, 2564238411, 304902857694, 61384367733677, 21020435566780278, 12292402317454051941, 12319906894146608845054, 21234027294331775378957366]

cp's OEIS Frontend

A128094 Number of sequences s of length n, with s[1]=1, s[2]=1, s[3]=1, s[k-1] <=s[k] <= s[k-1]+s[k-2]+s[k-3] (s is called a sub-tribonacci sequence of length n).

Table of values

List of values