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A137968 as a simple table

na(n)
01
11
26
327
4158
5981
66342
742728
8295008
92079882
1014908740
11108312873
12795836544
135903472999
1444151306690
15332552305818
162520416719368
1719207222744326
18147086508325056
191131292622149352
208735383810590486

[1,1,6,27,158,981,6342,42728,295008,2079882,
 14908740,108312873,795836544,5903472999,
 44151306690,332552305818,2520416719368,
 19207222744326,147086508325056,1131292622149352,
 8735383810590486]