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A037788 as a simple table

na(n)
13
220
3120
4721
54329
625976
7155856
8935137
95610825
1033664952
11201989712
121211938273
137271629641
1443629777848
15261778667088
161570672002529
179424032015177
1856544192091064
19339265152546384
202035590915278305

[3,20,120,721,4329,25976,155856,935137,5610825,
 33664952,201989712,1211938273,7271629641,
 43629777848,261778667088,1570672002529,
 9424032015177,56544192091064,339265152546384,
 2035590915278305]