A164424 - OEIS

A164424 as a simple table

n	a(n)
4	13
5	21
6	33
7	51
8	78
9	118
10	178
11	268
12	403
13	605
14	907
15	1359
16	2036
17	3050
18	4568
19	6840
20	10241
21	15333
22	22957
23	34371
24	51458
25	77038
26	115334
27	172668
28	258503
29	387005
30	579383
31	867391
32	1298568
33	1944082
34	2910476
35	4357256
36	6523221
37	9765877
38	14620441
39	21888179

[13,21,33,51,78,118,178,268,403,605,907,1359,2036, 3050,4568,6840,10241,15333,22957,34371,51458, 77038,115334,172668,258503,387005,579383,867391, 1298568,1944082,2910476,4357256,6523221,9765877, 14620441,21888179]