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A147980 as a simple table

na(n)
11
20
32
40
54
64
78
812
928
1044
1184
12156
13288
14540
151020
161904
173616
186860
1913024
2024836
2147448
2290772
23174072
24334348
25643112
261238928
272389956
284615916
298925808
3017278680
3133482196
3264944060
33126083448
34244989096
35476416560
36927167752
371805691728
383519062820

[1,0,2,0,4,4,8,12,28,44,84,156,288,540,1020,1904,
 3616,6860,13024,24836,47448,90772,174072,334348,
 643112,1238928,2389956,4615916,8925808,17278680,
 33482196,64944060,126083448,244989096,476416560,
 927167752,1805691728,3519062820]