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A308381 as a simple table

na(n)
01
11
22
34
416
556
6256
71072
811264
9119296
101075456
119088256
1285292032
13894690304
148968964096
1590882789376
162409397682176
1740515889528832
181051789297844224
1916251803853193216
20302342408330018816
214444559976664662016
2284010278329827459072
231289319649553742823424

[1,1,2,4,16,56,256,1072,11264,119296,1075456,
 9088256,85292032,894690304,8968964096,90882789376,
 2409397682176,40515889528832,1051789297844224,
 16251803853193216,302342408330018816,
 4444559976664662016,84010278329827459072,
 1289319649553742823424]