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A131403 as a simple table

na(n)
01
12
25
310
421
544
693
7196
8411
9856
101771
113642
127451
1315178
1430809
1562358
16125921
17253800
18510777
191026704
202061751
214137012
228295895
2316627190
2433311671
2566716054
26133582133
27267407026
28535206861
291071049316
302143127061
314287918172
328578528851
3317161414288

[1,2,5,10,21,44,93,196,411,856,1771,3642,7451,
 15178,30809,62358,125921,253800,510777,1026704,
 2061751,4137012,8295895,16627190,33311671,
 66716054,133582133,267407026,535206861,1071049316,
 2143127061,4287918172,8578528851,17161414288]