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A335720 as a simple table

na(n)
00
11
21
35
418
556
6191
7640
82133
97141
1023881
1179850
12267048
13893051
142986496
159987385
1633399513
17111693661
18373522786
191249124120
204177284903
2113969556096
2246716587501
23156228267805
24522454078593
251747175898106
265842855371016
2719539508829315
2865343463262208

[0,1,1,5,18,56,191,640,2133,7141,23881,79850,
 267048,893051,2986496,9987385,33399513,111693661,
 373522786,1249124120,4177284903,13969556096,
 46716587501,156228267805,522454078593,
 1747175898106,5842855371016,19539508829315,
 65343463262208]