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A149866 as a simple table

na(n)
01
12
25
313
440
5134
6467
71671
86172
923436
1090370
11354271
121410448
135681881
1423111260
1594915721
16393246863
171640456796
186888518741
1929110220069
20123682094892
21528032933464
222264948231740
239757427695261
2442194050729094
25183120618953859
26797497306584136
273483922404178219
2815263691795321215

[1,2,5,13,40,134,467,1671,6172,23436,90370,354271,
 1410448,5681881,23111260,94915721,393246863,
 1640456796,6888518741,29110220069,123682094892,
 528032933464,2264948231740,9757427695261,
 42194050729094,183120618953859,797497306584136,
 3483922404178219,15263691795321215]