A005251 - cp's OEIS frontend

A005251 a(0) = 0, a(1) = a(2) = a(3) = 1; thereafter, a(n) = a(n-1) + a(n-2) + a(n-4).

n	a(n)
0	0
1	1
2	1
3	1
4	2
5	4
6	7
7	12
8	21
9	37
10	65
11	114
12	200
13	351
14	616
15	1081
16	1897
17	3329
18	5842
19	10252
20	17991
21	31572
22	55405
23	97229
24	170625
25	299426
26	525456
27	922111
28	1618192
29	2839729
30	4983377
31	8745217
32	15346786
33	26931732
34	47261895
35	82938844
36	145547525
37	255418101
38	448227521

[0, 1, 1, 1, 2, 4, 7, 12, 21, 37, 65, 114, 200, 351, 616, 1081, 1897, 3329, 5842, 10252, 17991, 31572, 55405, 97229, 170625, 299426, 525456, 922111, 1618192, 2839729, 4983377, 8745217, 15346786, 26931732, 47261895, 82938844, 145547525, 255418101, 448227521]

cp's OEIS Frontend

A005251 a(0) = 0, a(1) = a(2) = a(3) = 1; thereafter, a(n) = a(n-1) + a(n-2) + a(n-4).

Table of values

List of values