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A063807 as a simple table

na(n)
00
12
25
312
425
554
6113
7240
8481
9968
101939
113888
127777
1315566
1431135
1562274
16124571
17249148
18498329
19996660
201993349
213986706
227973417
2315946836
2431893677
2563787390
26127574781
27255149570
28510299161
291020598332
302041196671
314082393354
328164786741
3316329573512

[0,2,5,12,25,54,113,240,481,968,1939,3888,7777,
 15566,31135,62274,124571,249148,498329,996660,
 1993349,3986706,7973417,15946836,31893677,
 63787390,127574781,255149570,510299161,1020598332,
 2041196671,4082393354,8164786741,16329573512]