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A107373 as a simple table

na(n)
10
20
31
42
57
614
738
876
9187
10374
11874
121748
133958
147916
1517548
1635096
1776627
18153254
19330818
20661636
211415650
222831300
236015316
2412030632
2525413342
2650826684
27106853668
28213707336
29447472972
30894945944
311867450648
323734901296
337770342787
3415540685574

[0,0,1,2,7,14,38,76,187,374,874,1748,3958,7916,
 17548,35096,76627,153254,330818,661636,1415650,
 2831300,6015316,12030632,25413342,50826684,
 106853668,213707336,447472972,894945944,
 1867450648,3734901296,7770342787,15540685574]