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A097940 as a simple table

na(n)
11
24
38
420
537
686
7173
8372
9788
101680
113550
127554
1315994
1433820
1571374
16150376
17316151
18663474
191389760
202906116
216066899
2212645608
2326318870
2454700044
25113536171
26235363832
27487342781
281007969620
292082597193
304298660754
318864505305
3218263797648
3337597869188

[1,4,8,20,37,86,173,372,788,1680,3550,7554,15994,
 33820,71374,150376,316151,663474,1389760,2906116,
 6066899,12645608,26318870,54700044,113536171,
 235363832,487342781,1007969620,2082597193,
 4298660754,8864505305,18263797648,37597869188]