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A089883 as a simple table

na(n)
01
14
216
360
4214
5736
62464
78082
826092
983188
10262582
11822144
122557120
137910050
1424357580
1574720436
16228485158
17696795712
182120116768
196438264498
2019518937516
2159091592564
22178675498006
23539694923520
241628691435904
254911230068546
2614799559211404

[1,4,16,60,214,736,2464,8082,26092,83188,262582,
 822144,2557120,7910050,24357580,74720436,
 228485158,696795712,2120116768,6438264498,
 19518937516,59091592564,178675498006,539694923520,
 1628691435904,4911230068546,14799559211404]