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A271808 as a simple table

na(n)
01
15
228
3156
4641
52913
611324
745880
8184632
9740372
102966293
1111875196
1247500072
13190022977
14760280365
153041361309

[1,5,28,156,641,2913,11324,45880,184632,740372,
 2966293,11875196,47500072,190022977,760280365,
 3041361309]