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A098648 as a simple table

na(n)
01
13
214
372
4376
51968
610304
753952
8282496
91479168
107745024
1140553472
12212340736
131111830528
145821620224
1530482399232
16159607914496
17835717890048
184375875682304
1922912382533632
20119970792472576
21628175224700928
223289168178315264
2317222308171087872

[1,3,14,72,376,1968,10304,53952,282496,1479168,
 7745024,40553472,212340736,1111830528,5821620224,
 30482399232,159607914496,835717890048,
 4375875682304,22912382533632,119970792472576,
 628175224700928,3289168178315264,
 17222308171087872]