A124400 - cp's OEIS frontend

A124400 a(n) = a(n-1) + 3*a(n-2) - a(n-4), with a(0)=1, a(1)=1, a(2)=4, a(3)=7.

n	a(n)
0	1
1	1
2	4
3	7
4	18
5	38
6	88
7	195
8	441
9	988
10	2223
11	4992
12	11220
13	25208
14	56645
15	127277
16	285992
17	642615
18	1443946
19	3244514
20	7290360
21	16381287
22	36808421
23	82707768
24	185842671
25	417584688
26	938304280
27	2108350576
28	4737420745
29	10644887785
30	23918845740

[1, 1, 4, 7, 18, 38, 88, 195, 441, 988, 2223, 4992, 11220, 25208, 56645, 127277, 285992, 642615, 1443946, 3244514, 7290360, 16381287, 36808421, 82707768, 185842671, 417584688, 938304280, 2108350576, 4737420745, 10644887785, 23918845740]

cp's OEIS Frontend

A124400 a(n) = a(n-1) + 3*a(n-2) - a(n-4), with a(0)=1, a(1)=1, a(2)=4, a(3)=7.

Table of values

List of values