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A111281 as a simple table

na(n)
01
11
22
36
416
540
6100
7252
8636
91604
104044
1110196
1225708
1364820
14163436
15412084
161039020
172619764
186605420
1916654772
2041993004
21105880308
22266964460
23673118772
241697188012
254279255412
2610789627756
2727204748468
2868593500716
29172950260724
30436073277676

[1,1,2,6,16,40,100,252,636,1604,4044,10196,25708,
 64820,163436,412084,1039020,2619764,6605420,
 16654772,41993004,105880308,266964460,673118772,
 1697188012,4279255412,10789627756,27204748468,
 68593500716,172950260724,436073277676]