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A216959 as a simple table

na(n)
11
21
32
43
55
610
718
836
971
10140
11280
12557
131111
142218
154432
168859
1717710
1835412
1970812
20141605
21283197
22566364
231132695
242265363
254530659
269061259
2718122454
2836244783
2972489435
30144978745
31289957235
32579914215
331159828166
342319655810
354639311084
369278621655

[1,1,2,3,5,10,18,36,71,140,280,557,1111,2218,4432,
 8859,17710,35412,70812,141605,283197,566364,
 1132695,2265363,4530659,9061259,18122454,36244783,
 72489435,144978745,289957235,579914215,1159828166,
 2319655810,4639311084,9278621655]