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A279112 as a simple table

na(n)
10
20
32
420
5138
6505
71547
83759
98313
1016350
1130344
1252470
1387212
14138255
15212953
16317065
17461827
18655724
19915038
201251720
211688414
222241365
232941047
243808915
254884893
266196650
277795332
289715914
2912022688
3014759115
3118004709
3221812685
3326280007
3431471000
3537502458

[0,0,2,20,138,505,1547,3759,8313,16350,30344,
 52470,87212,138255,212953,317065,461827,655724,
 915038,1251720,1688414,2241365,2941047,3808915,
 4884893,6196650,7795332,9715914,12022688,14759115,
 18004709,21812685,26280007,31471000,37502458]