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A077821 as a simple table

na(n)
01
14
216
364
4253
51000
63952
715616
861705
9243820
10963424
113806848
1215042277
1359437648
14234860320
15928020736
163666956113
1714489511508
1857253465072
19226229798080
20893918323981
213532204761400
2213957058650384
2355149545207296
24217916425857241
25861069089144764

[1,4,16,64,253,1000,3952,15616,61705,243820,
 963424,3806848,15042277,59437648,234860320,
 928020736,3666956113,14489511508,57253465072,
 226229798080,893918323981,3532204761400,
 13957058650384,55149545207296,217916425857241,
 861069089144764]