A154154 - OEIS

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A154154 as a simple table

n	a(n)
1	3
2	13
3	34
4	84
5	203
6	493
7	1186
8	2876
9	6915
10	16765
11	40306
12	97716
13	234923
14	569533
15	1369234
16	3319484
17	7980483
18	19347373
19	46513666

[3,13,34,84,203,493,1186,2876,6915,16765,40306, 97716,234923,569533,1369234,3319484,7980483, 19347373,46513666]