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A001472 as a simple table

na(n)
01
11
22
34
416
556
6256
71072
86224
933616
10218656
111326656
129893632
1370186624
14574017536
154454046976
1640073925376
17347165733632
183370414011904
1931426411211776
20328454079574016
213331595921852416
2237125035407900672
23400800185285464064

[1,1,2,4,16,56,256,1072,6224,33616,218656,1326656,
 9893632,70186624,574017536,4454046976,40073925376,
 347165733632,3370414011904,31426411211776,
 328454079574016,3331595921852416,
 37125035407900672,400800185285464064]