A101399 - cp's OEIS frontend

A101399 a(0) = 1, a(1) = 2, a(2) = 5; for n >= 3, a(n) = a(n-1) + 2*a(n-2) + a(n-3).

n	a(n)
0	1
1	2
2	5
3	10
4	22
5	47
6	101
7	217
8	466
9	1001
10	2150
11	4618
12	9919
13	21305
14	45761
15	98290
16	211117
17	453458
18	973982
19	2092015
20	4493437
21	9651449
22	20730338
23	44526673
24	95638798
25	205422482
26	441226751
27	947710513
28	2035586497
29	4372234274

[1, 2, 5, 10, 22, 47, 101, 217, 466, 1001, 2150, 4618, 9919, 21305, 45761, 98290, 211117, 453458, 973982, 2092015, 4493437, 9651449, 20730338, 44526673, 95638798, 205422482, 441226751, 947710513, 2035586497, 4372234274]

cp's OEIS Frontend

A101399 a(0) = 1, a(1) = 2, a(2) = 5; for n >= 3, a(n) = a(n-1) + 2*a(n-2) + a(n-3).

Table of values

List of values