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A303715 as a simple table

na(n)
15
25
38
417
536
676
7161
8349
9749
101604
113449
127412
1315912
1434177
1573421
16157693
17338696
18727505
191562612
203356300
217209009
2215484261
2333258581
2471436052
25153437513
26329568260
27707879240
281520453249
293265780149
307014565813

[5,5,8,17,36,76,161,349,749,1604,3449,7412,15912,
 34177,73421,157693,338696,727505,1562612,3356300,
 7209009,15484261,33258581,71436052,153437513,
 329568260,707879240,1520453249,3265780149,
 7014565813]