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A248870 as a simple table

na(n)
00
11
21
33
48
523
662
7181
8513
91513
104476
1113483
1240933
13125845
14389769
151217590
163828775
1712115966
1838546124
19123238296
20395725493
211275733730
224127339091
2313396443708
2443610621823
25142354979662
26465838195260
271527905193504
285022061115901
2916539625666670
3054571760414658

[0,1,1,3,8,23,62,181,513,1513,4476,13483,40933,
 125845,389769,1217590,3828775,12115966,38546124,
 123238296,395725493,1275733730,4127339091,
 13396443708,43610621823,142354979662,465838195260,
 1527905193504,5022061115901,16539625666670,
 54571760414658]