A111587 - cp's OEIS frontend

A111587 a(n) = 2a(n-1) + 2a(n-3) + a(n-4), a(0) = 1, a(1) = 4, a(2) = 9, a(3) = 20.

n	a(n)
0	1
1	4
2	9
3	20
4	49
5	120
6	289
7	696
8	1681
9	4060
10	9801
11	23660
12	57121
13	137904
14	332929
15	803760
16	1940449
17	4684660
18	11309769
19	27304196
20	65918161
21	159140520
22	384199201
23	927538920
24	2239277041
25	5406093004
26	13051463049
27	31509019100
28	76069501249

[1, 4, 9, 20, 49, 120, 289, 696, 1681, 4060, 9801, 23660, 57121, 137904, 332929, 803760, 1940449, 4684660, 11309769, 27304196, 65918161, 159140520, 384199201, 927538920, 2239277041, 5406093004, 13051463049, 31509019100, 76069501249]

cp's OEIS Frontend

A111587 a(n) = 2a(n-1) + 2a(n-3) + a(n-4), a(0) = 1, a(1) = 4, a(2) = 9, a(3) = 20.

Table of values

List of values

cp's OEIS Frontend

A111587 a(n) = 2*a(n-1) + 2*a(n-3) + a(n-4), a(0) = 1, a(1) = 4, a(2) = 9, a(3) = 20.

Table of values

List of values

A111587 a(n) = 2a(n-1) + 2a(n-3) + a(n-4), a(0) = 1, a(1) = 4, a(2) = 9, a(3) = 20.