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A252942 as a simple table

na(n)
0101
1313
2727
3131
411411
5151
613613
7373
8181
9191
109109
11131113
127127
13171317
14131413
151151
163163
171171
181181
199199
201201
21112111
22172217
231231
247247
253253
26372637
27172717
28232823
291291
301301
313313
321321
33233323
343343
35273527
361361
373373
381381
39173917
40174017

[101,313,727,131,11411,151,13613,373,181,191,9109,
 131113,7127,171317,131413,1151,3163,1171,1181,
 9199,1201,112111,172217,1231,7247,3253,372637,
 172717,232823,1291,1301,3313,1321,233323,3343,
 273527,1361,3373,1381,173917,174017]