A014169 - OEIS

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A014169 as a simple table

n	a(n)
1	1
2	4
3	11
4	25
5	51
6	98
7	182
8	331
9	595
10	1063
11	1894
12	3373
13	6010
14	10719
15	19139
16	34208
17	61195
18	109551
19	196228
20	351636
21	630330
22	1130181
23	2026775
24	3635128
25	6520408
26	11696591
27	20982875
28	37643135
29	67533204

[1,4,11,25,51,98,182,331,595,1063,1894,3373,6010, 10719,19139,34208,61195,109551,196228,351636, 630330,1130181,2026775,3635128,6520408,11696591, 20982875,37643135,67533204]