A026299 - cp's OEIS frontend

A026299 Number of (s(0), s(1), ..., s(n)) such that every s(i) is a nonnegative integer, s(0) = 0, s(1) = 1, |s(i) - s(i-1)| <= 1 for i >= 2, |s(2) - s(1)| = 1, |s(3) - s(2)| = 1 if s(2) = 1. Also sum of numbers in row n+1 of the array T in A026268.

n	a(n)
0	1
1	3
2	7
3	19
4	53
5	149
6	422
7	1202
8	3440
9	9884
10	28495
11	82387
12	238801
13	693689
14	2018981
15	5886329
16	17187891
17	50257299
18	147135189
19	431245977
20	1265264799
21	3715761759
22	10921722348
23	32127865392
24	94578844458
25	278614855862
26	821281118993
27	2422356077357
28	7148679142639

[1, 3, 7, 19, 53, 149, 422, 1202, 3440, 9884, 28495, 82387, 238801, 693689, 2018981, 5886329, 17187891, 50257299, 147135189, 431245977, 1265264799, 3715761759, 10921722348, 32127865392, 94578844458, 278614855862, 821281118993, 2422356077357, 7148679142639]

cp's OEIS Frontend

A026299 Number of (s(0), s(1), ..., s(n)) such that every s(i) is a nonnegative integer, s(0) = 0, s(1) = 1, |s(i) - s(i-1)| <= 1 for i >= 2, |s(2) - s(1)| = 1, |s(3) - s(2)| = 1 if s(2) = 1. Also sum of numbers in row n+1 of the array T in A026268.

Table of values

List of values