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A155363 as a simple table

na(n)
51
67
719
837
979
10331
111971
1211437
1356649
14326778
152556228
1626440896
17303972325
183581795416
1947721457149
20785585027118

[1,7,19,37,79,331,1971,11437,56649,326778,2556228,
 26440896,303972325,3581795416,47721457149,
 785585027118]