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A346505 as a simple table

na(n)
01
12
24
312
444
5172
6700
72940
812652
955500
10247260
111115740
125088908
1323423020
14108659324
15507520316
162384733868
1711264884876
1853464215580
19254822253852
201219182031820
215853309920748
2228190437248700
23136160853462524
24659401832797676
253201141695492172
2615575294057678428

[1,2,4,12,44,172,700,2940,12652,55500,247260,
 1115740,5088908,23423020,108659324,507520316,
 2384733868,11264884876,53464215580,254822253852,
 1219182031820,5853309920748,28190437248700,
 136160853462524,659401832797676,3201141695492172,
 15575294057678428]