A317976 - cp's OEIS frontend

A317976 a(n) = 2*(a(n-1)+a(n-2)+a(n-3))-a(n-4) for n >= 4, with initial terms 0,0,1,0.

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	6
6	15
7	46
8	132
9	380
10	1101
11	3180
12	9190
13	26562
14	76763
15	221850
16	641160
17	1852984
18	5355225
19	15476888
20	44729034
21	129269310
22	373595239
23	1079710278
24	3120420620
25	9018182964
26	26063032485
27	75323561860
28	217689133998
29	629133273722
30	1818228906675
31	5254779066930
32	15186593360656
33	43890069394800
34	126844654738097

[0, 0, 1, 0, 2, 6, 15, 46, 132, 380, 1101, 3180, 9190, 26562, 76763, 221850, 641160, 1852984, 5355225, 15476888, 44729034, 129269310, 373595239, 1079710278, 3120420620, 9018182964, 26063032485, 75323561860, 217689133998, 629133273722, 1818228906675, 5254779066930, 15186593360656, 43890069394800, 126844654738097]

cp's OEIS Frontend

A317976 a(n) = 2*(a(n-1)+a(n-2)+a(n-3))-a(n-4) for n >= 4, with initial terms 0,0,1,0.

Table of values

List of values