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A027220 as a simple table

na(n)
01
13
28
320
452
5121
6301
7675
81628
93570
108426
1118202
1242288
1390374
14207464
15439800
161000194
172106961
184755715
199967599
2022359788
2146670273
22104154703
23216643945
24481381746
25998346275
262210037191
274571884119
2810088030640

[1,3,8,20,52,121,301,675,1628,3570,8426,18202,
 42288,90374,207464,439800,1000194,2106961,4755715,
 9967599,22359788,46670273,104154703,216643945,
 481381746,998346275,2210037191,4571884119,
 10088030640]