A328990 - cp's OEIS frontend

A328990 a(n) = (3*b(n) + b(n-1) + 1)/2, where b = A005409.

n	a(n)
1	2
2	7
3	19
4	48
5	118
6	287
7	695
8	1680
9	4058
10	9799
11	23659
12	57120
13	137902
14	332927
15	803759
16	1940448
17	4684658
18	11309767
19	27304195
20	65918160
21	159140518
22	384199199
23	927538919
24	2239277040
25	5406093002
26	13051463047
27	31509019099
28	76069501248
29	183648021598
30	443365544447

[2, 7, 19, 48, 118, 287, 695, 1680, 4058, 9799, 23659, 57120, 137902, 332927, 803759, 1940448, 4684658, 11309767, 27304195, 65918160, 159140518, 384199199, 927538919, 2239277040, 5406093002, 13051463047, 31509019099, 76069501248, 183648021598, 443365544447]

cp's OEIS Frontend

A328990 a(n) = (3*b(n) + b(n-1) + 1)/2, where b = A005409.

Table of values

List of values