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A155227 as a simple table

na(n)
31
47
519
637
7161
81807
911923
1074305
11996497
1220101489
13343266000
147112429890
15240727989195
1610493604835431
17491234457919198
1829614138644308932
192497584802462395442

[1,7,19,37,161,1807,11923,74305,996497,20101489,
 343266000,7112429890,240727989195,10493604835431,
 491234457919198,29614138644308932,
 2497584802462395442]