A161999 - cp's OEIS frontend

A161999 For n even a(n) = a(n-1) + 10*a(n-2), for n odd a(n) = a(n-3) + 10 a(n-2); with a(1) = 0, a(2) = 1.

n	a(n)
1	0
2	1
3	1
4	10
5	20
6	101
7	301
8	1030
9	4040
10	10601
11	51001
12	110050
13	620060
14	1151501
15	7352101
16	12135070
17	85656080
18	128702801
19	985263601
20	1372684090
21	11225320100
22	14712104501
23	126965305501
24	158346365110
25	1427999420120

[0, 1, 1, 10, 20, 101, 301, 1030, 4040, 10601, 51001, 110050, 620060, 1151501, 7352101, 12135070, 85656080, 128702801, 985263601, 1372684090, 11225320100, 14712104501, 126965305501, 158346365110, 1427999420120]

cp's OEIS Frontend

A161999 For n even a(n) = a(n-1) + 10*a(n-2), for n odd a(n) = a(n-3) + 10 a(n-2); with a(1) = 0, a(2) = 1.

Table of values

List of values