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A049680 as a simple table

na(n)
02
12
25
311
427
567
6170
7436
81127
92927
107625
1119901
1252002
13135982
14355745
15930931
162436527
176377807
1816695530
1943706576
20114420627
21299549527
22784218605
232053091161
245375030402
2514071960442
2636840786845
2796450296411

[2,2,5,11,27,67,170,436,1127,2927,7625,19901,
 52002,135982,355745,930931,2436527,6377807,
 16695530,43706576,114420627,299549527,784218605,
 2053091161,5375030402,14071960442,36840786845,
 96450296411]