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A248422 as a simple table

na(n)
122
244
366
488
51010
61212
71414
81616
91818
102020
112222
122424
132626
142828
153030
163232
173434
183636
193838
204040
214242
224444
234646
244848
255050
265252
275454
285656
295858
306060
316262
326464
336666
346868
357070
367272
377474
387676
397878
408080
418282
428484
438686
448888
459090
469292
479494
489696
499898
50100100

[22,44,66,88,1010,1212,1414,1616,1818,2020,2222,
 2424,2626,2828,3030,3232,3434,3636,3838,4040,4242,
 4444,4646,4848,5050,5252,5454,5656,5858,6060,6262,
 6464,6666,6868,7070,7272,7474,7676,7878,8080,8282,
 8484,8686,8888,9090,9292,9494,9696,9898,100100]