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A281922 as a simple table

na(n)
22
35
44
517
6-1
7109
88
965
1089
111115
12-1
137297
142531
154369
1616
17257
18155174
19195814
20495146
215201
221334551
231725452
241485482
25-1
26-1
27-1
2817256565
29277691849
306145997
312029501
3232
331025
3467672804
351157011598
3612054050100
3722287270331
3815597512810
39-1

[2,5,4,17,-1,109,8,65,89,1115,-1,7297,2531,4369,
 16,257,155174,195814,495146,5201,1334551,1725452,
 1485482,-1,-1,-1,17256565,277691849,6145997,
 2029501,32,1025,67672804,1157011598,12054050100,
 22287270331,15597512810,-1]