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A019019 as a simple table

na(n)
22
34
426
5134
6958
76034
837650
9242504
101590952
1110574462
1271449792
13489478402
143388172486
1523660827272
16166485808342

[2,4,26,134,958,6034,37650,242504,1590952,
 10574462,71449792,489478402,3388172486,
 23660827272,166485808342]