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A253831 as a simple table

na(n)
01
12
25
312
430
576
6197
7522
81418
93956
1011354
1133554
12102104
13319608
141027237
153381714
1611371366
1738946892
18135505958
19477781296
201703671604
216132978608
2222256615602
2381327116484
24298938112816
251104473254912
264098996843500
2715272792557230
2857106723430892
29214202598271360
30805743355591301

[1,2,5,12,30,76,197,522,1418,3956,11354,33554,
 102104,319608,1027237,3381714,11371366,38946892,
 135505958,477781296,1703671604,6132978608,
 22256615602,81327116484,298938112816,
 1104473254912,4098996843500,15272792557230,
 57106723430892,214202598271360,805743355591301]