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A187980 as a simple table

na(n)
10
21
33
49
536
6117
7411
81452
95040
1017829
1162870
12222458
13789895
142808018
1510006020
1635713288
17127657287
18456975112
191637845137
205876993799
2121110257429
2275900966585
23273140226328
24983733709424
253545658087397
2612788512426396
2746155740640489
28166684398100813
29602296651467057
302177492178467267
317876245417001355

[0,1,3,9,36,117,411,1452,5040,17829,62870,222458,
 789895,2808018,10006020,35713288,127657287,
 456975112,1637845137,5876993799,21110257429,
 75900966585,273140226328,983733709424,
 3545658087397,12788512426396,46155740640489,
 166684398100813,602296651467057,2177492178467267,
 7876245417001355]