A025105 - OEIS

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A025105 as a simple table

n	a(n)
1	2
2	3
3	11
4	18
5	44
6	71
7	155
8	251
9	510
10	825
11	1608
12	2602
13	4924
14	7967
15	14761
16	23884
17	43540
18	70449
19	126805
20	205175
21	365532
22	591443
23	1044816
24	1690548
25	2965334
26	4798011
27	8365415

[2,3,11,18,44,71,155,251,510,825,1608,2602,4924, 7967,14761,23884,43540,70449,126805,205175,365532, 591443,1044816,1690548,2965334,4798011,8365415]