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A187981 as a simple table

na(n)
10
22
35
415
557
6181
7632
82199
97593
1026706
1193724
12330555
131170088
144149361
1514754670
1652564714
17187595025
18670589799
192400467901
208603906865
2130874479617
22110907636467
23398789645747
241435195800184
255169318396770
2618633022691923
2767210498566801
28242590233305619
29876138147816208
303166048659124955
3111447024096561941
3241407915745717488

[0,2,5,15,57,181,632,2199,7593,26706,93724,330555,
 1170088,4149361,14754670,52564714,187595025,
 670589799,2400467901,8603906865,30874479617,
 110907636467,398789645747,1435195800184,
 5169318396770,18633022691923,67210498566801,
 242590233305619,876138147816208,3166048659124955,
 11447024096561941,41407915745717488]