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A218958 as a simple table

na(n)
01
11
21
34
413
531
6246
71296
810774
983238
10788820
116835170
1281364944
13848378532
1411423650616
15156289508025
162380629720720
1733284133330760
18605934954285120
199708364832948820
20190330953679235040
213715069138923234960
2277101583995105472880
231506549946554254503440

[1,1,1,4,13,31,246,1296,10774,83238,788820,
 6835170,81364944,848378532,11423650616,
 156289508025,2380629720720,33284133330760,
 605934954285120,9708364832948820,
 190330953679235040,3715069138923234960,
 77101583995105472880,1506549946554254503440]