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A165215 as a simple table

na(n)
01
18
256
3392
42744
519208
6134456
7941192
86588344
946118380
10322828464
112259797904
1215818575920
13110729965584
14775109298096
155425761859728
1637980310429488
17265862014886160
181861032997362084
1913027223233652040

[1,8,56,392,2744,19208,134456,941192,6588344,
 46118380,322828464,2259797904,15818575920,
 110729965584,775109298096,5425761859728,
 37980310429488,265862014886160,1861032997362084,
 13027223233652040]