A022381 - OEIS

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A022381 as a simple table

n	a(n)
0	3
1	15
2	18
3	33
4	51
5	84
6	135
7	219
8	354
9	573
10	927
11	1500
12	2427
13	3927
14	6354
15	10281
16	16635
17	26916
18	43551
19	70467
20	114018
21	184485
22	298503
23	482988
24	781491
25	1264479
26	2045970
27	3310449
28	5356419
29	8666868
30	14023287

[3,15,18,33,51,84,135,219,354,573,927,1500,2427, 3927,6354,10281,16635,26916,43551,70467,114018, 184485,298503,482988,781491,1264479,2045970, 3310449,5356419,8666868,14023287]