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A105872 as a simple table

na(n)
01
12
26
321
475
5273
61009
73770
814202
953846
10205216
11785460
123017106
1311624580
1444905518
15173863965
16674506059
172621371005
1810203609597
1939773263035
20155231706951
21606554343495
222372544034143
239289131196485
2436401388236461

[1,2,6,21,75,273,1009,3770,14202,53846,205216,
 785460,3017106,11624580,44905518,173863965,
 674506059,2621371005,10203609597,39773263035,
 155231706951,606554343495,2372544034143,
 9289131196485,36401388236461]