A214826 - cp's OEIS frontend

A214826 a(n) = a(n-1) + a(n-2) + a(n-3), with a(0) = 1, a(1) = a(2) = 4.

n	a(n)
0	1
1	4
2	4
3	9
4	17
5	30
6	56
7	103
8	189
9	348
10	640
11	1177
12	2165
13	3982
14	7324
15	13471
16	24777
17	45572
18	83820
19	154169
20	283561
21	521550
22	959280
23	1764391
24	3245221
25	5968892
26	10978504
27	20192617
28	37140013
29	68311134
30	125643764
31	231094911
32	425049809

[1, 4, 4, 9, 17, 30, 56, 103, 189, 348, 640, 1177, 2165, 3982, 7324, 13471, 24777, 45572, 83820, 154169, 283561, 521550, 959280, 1764391, 3245221, 5968892, 10978504, 20192617, 37140013, 68311134, 125643764, 231094911, 425049809]

cp's OEIS Frontend

A214826 a(n) = a(n-1) + a(n-2) + a(n-3), with a(0) = 1, a(1) = a(2) = 4.

Table of values

List of values