A067986 - OEIS

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A067986 as a simple table

n	a(n)
0	47
1	217
2	539
3	1201
4	2460
5	4826
6	9171
7	17047
8	31153
9	56185
10	100258
11	177348
12	311431
13	543509
14	943495
15	1630289
16	2805624
17	4811038
18	8223627
19	14016755
20	23829437
21	40417337
22	68406974
23	115555656
24	194854175

[47,217,539,1201,2460,4826,9171,17047,31153,56185, 100258,177348,311431,543509,943495,1630289, 2805624,4811038,8223627,14016755,23829437, 40417337,68406974,115555656,194854175]