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A131509 as a simple table

na(n)
01
14
233
3220
41005
53456
69709
723528
850985
9101260
10187561
11328164
12547573
13877800
141359765
152044816
162996369
174291668
186023665
198303020
2011260221
2115047824
2219842813
2325849080
2433300025
2542461276
2653633529
2767155508
2883407045
29102812280
30125842981

[1,4,33,220,1005,3456,9709,23528,50985,101260,
 187561,328164,547573,877800,1359765,2044816,
 2996369,4291668,6023665,8303020,11260221,15047824,
 19842813,25849080,33300025,42461276,53633529,
 67155508,83407045,102812280,125842981]