A331074 - cp's OEIS frontend

A331074 a(n) = Sum_{k = 1..ceiling(n/2)} [d_3(k)*d_3(n+1-k)], where d_3 = A007425.

n	a(n)
0	0
1	1
2	3
3	12
4	15
5	30
6	36
7	75
8	64
9	108
10	102
11	198
12	147
13	237
14	201
15	361
16	255
17	435
18	318
19	552
20	417
21	630
22	459
23	963
24	537
25	888
26	696
27	1099
28	714
29	1302
30	810
31	1503
32	1044
33	1506
34	1000
35	2103
36	1119
37	1869
38	1443
39	2337
40	1344
41	2568
42	1464
43	2697
44	1884
45	2676
46	1710
47	3966
48	1839
49	3150
50	2400
51	3714
52	2115
53	4189
54	2292
55	4359
56	2943
57	4098

[0, 1, 3, 12, 15, 30, 36, 75, 64, 108, 102, 198, 147, 237, 201, 361, 255, 435, 318, 552, 417, 630, 459, 963, 537, 888, 696, 1099, 714, 1302, 810, 1503, 1044, 1506, 1000, 2103, 1119, 1869, 1443, 2337, 1344, 2568, 1464, 2697, 1884, 2676, 1710, 3966, 1839, 3150, 2400, 3714, 2115, 4189, 2292, 4359, 2943, 4098]

cp's OEIS Frontend

A331074 a(n) = Sum_{k = 1..ceiling(n/2)} [d_3(k)*d_3(n+1-k)], where d_3 = A007425.

Table of values

List of values