A024878 - OEIS

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A024878 as a simple table

n	a(n)
2	6
3	9
4	27
5	44
6	96
7	155
8	299
9	484
10	874
11	1414
12	2456
13	3974
14	6736
15	10899
16	18185
17	29424
18	48588
19	78617
20	128933
21	208618
22	340580
23	551070
24	896928
25	1451260
26	2357338
27	3814253
28	6187383

[6,9,27,44,96,155,299,484,874,1414,2456,3974,6736, 10899,18185,29424,48588,78617,128933,208618, 340580,551070,896928,1451260,2357338,3814253, 6187383]