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A118677 as a simple table

na(n)
01
12
26
318
460
5202
6718
72600
89748
937270
10146058
11582548
122367028
139761890
1440844168
15173001018
16741193056
173207480526
1814008373662
1961683982696
20273658651700
211222314257450
225493414465900
2324828463984518

[1,2,6,18,60,202,718,2600,9748,37270,146058,
 582548,2367028,9761890,40844168,173001018,
 741193056,3207480526,14008373662,61683982696,
 273658651700,1222314257450,5493414465900,
 24828463984518]