A331073 - cp's OEIS frontend

A331073 a(n) = Sum_{k = 1..n} [d_3(k)*d_3(n+1-k)], where d_3 = A007425.

n	a(n)
0	0
1	1
2	6
3	15
4	30
5	51
6	72
7	114
8	128
9	207
10	204
11	315
12	294
13	465
14	402
15	622
16	510
17	834
18	636
19	1023
20	834
21	1251
22	918
23	1602
24	1074
25	1767
26	1392
27	2117
28	1428
29	2523
30	1620
31	2781
32	2088
33	3003
34	2000
35	3882
36	2238
37	3729
38	2886
39	4350
40	2688
41	5055
42	2928
43	5313
44	3768
45	5343
46	3420
47	7032
48	3678
49	6264
50	4800
51	7347
52	4230
53	8278
54	4584
55	8394

[0, 1, 6, 15, 30, 51, 72, 114, 128, 207, 204, 315, 294, 465, 402, 622, 510, 834, 636, 1023, 834, 1251, 918, 1602, 1074, 1767, 1392, 2117, 1428, 2523, 1620, 2781, 2088, 3003, 2000, 3882, 2238, 3729, 2886, 4350, 2688, 5055, 2928, 5313, 3768, 5343, 3420, 7032, 3678, 6264, 4800, 7347, 4230, 8278, 4584, 8394]

cp's OEIS Frontend

A331073 a(n) = Sum_{k = 1..n} [d_3(k)*d_3(n+1-k)], where d_3 = A007425.

Table of values

List of values