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A373740 as a simple table

na(n)
01
10
21
33
43
530
6105
7315
82625
911340
1057645
11467775
122505195
1317027010
14142026885
15922296375
167493911425
1765886420600
18503693415225
194625660914875
2043369908657075
21379618464975750
223824934458169825
2338406952928819475
24376103907454500225

[1,0,1,3,3,30,105,315,2625,11340,57645,467775,
 2505195,17027010,142026885,922296375,7493911425,
 65886420600,503693415225,4625660914875,
 43369908657075,379618464975750,3824934458169825,
 38406952928819475,376103907454500225]