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A231308 as a simple table

na(n)
00
11
2512
319684
4262656
51972809
610340352
742326416
8144558080
9429746905
101144558080
112787694596
126304338432
1313392193969
1426965385216
1551835553344
1695684861952
17170423429841
18294044152320
19493111127620
20806044152320
211287391174201
222013313370112

[0,1,512,19684,262656,1972809,10340352,42326416,
 144558080,429746905,1144558080,2787694596,
 6304338432,13392193969,26965385216,51835553344,
 95684861952,170423429841,294044152320,
 493111127620,806044152320,1287391174201,
 2013313370112]