A285187 - cp's OEIS frontend

A285187 a(n) = Sum(psi(k-1)*psi(n-k-1),k=0..n)+(1-(-1)^n)/2, where psi(k) = A000931(k+6).

n	a(n)
0	1
1	3
2	3
3	7
4	9
5	15
6	22
7	33
8	48
9	71
10	101
11	147
12	208
13	297
14	419
15	591
16	829
17	1161
18	1619
19	2255
20	3130
21	4339
22	6000
23	8285
24	11419
25	15717
26	21600
27	29649
28	40645
29	55659
30	76135
31	104043
32	142045
33	193759
34	264078
35	359637
36	489408
37	665539
38	904449
39	1228343
40	1667216
41	2261593
42	3066183

[1, 3, 3, 7, 9, 15, 22, 33, 48, 71, 101, 147, 208, 297, 419, 591, 829, 1161, 1619, 2255, 3130, 4339, 6000, 8285, 11419, 15717, 21600, 29649, 40645, 55659, 76135, 104043, 142045, 193759, 264078, 359637, 489408, 665539, 904449, 1228343, 1667216, 2261593, 3066183]

cp's OEIS Frontend

A285187 a(n) = Sum(psi(k-1)*psi(n-k-1),k=0..n)+(1-(-1)^n)/2, where psi(k) = A000931(k+6).

Table of values

List of values