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A229286 as a simple table

na(n)
01
11
24
318
4102
5684
65216
744388
8415672
94234904
1046525992
11547327904
126854491840
1390940138256
141272862982272
1518728235407712
16288765445378272
174653013453323968
1878164063007644288
191365903793778043712
2024781386644286473856
21465969812835308934272
229066115469486822859392

[1,1,4,18,102,684,5216,44388,415672,4234904,
 46525992,547327904,6854491840,90940138256,
 1272862982272,18728235407712,288765445378272,
 4653013453323968,78164063007644288,
 1365903793778043712,24781386644286473856,
 465969812835308934272,9066115469486822859392]