A261568 - cp's OEIS frontend

A261568 Expansion of Product_{k>=1} (1 + 4*x^k).

n	a(n)
0	1
1	4
2	4
3	20
4	20
5	36
6	100
7	116
8	180
9	260
10	580
11	660
12	1044
13	1380
14	2020
15	3444
16	4340
17	6020
18	8260
19	11220
20	14740
21	23140
22	28196
23	38900
24	50420
25	67780
26	85956
27	114900
28	157140
29	197860
30	257060
31	331060
32	423540
33	540100
34	687620
35	864084
36	1145300
37	1406500
38	1789860
39	2231860

[1, 4, 4, 20, 20, 36, 100, 116, 180, 260, 580, 660, 1044, 1380, 2020, 3444, 4340, 6020, 8260, 11220, 14740, 23140, 28196, 38900, 50420, 67780, 85956, 114900, 157140, 197860, 257060, 331060, 423540, 540100, 687620, 864084, 1145300, 1406500, 1789860, 2231860]

cp's OEIS Frontend

A261568 Expansion of Product_{k>=1} (1 + 4*x^k).

Table of values

List of values