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A042981 as a simple table

na(n)
11
20
31
41
51
63
74
88
915
1024
1148
1285
13155
14297
15541
161024
171935
183626
196912
2013107
2124940
2247709
2391136
24174760
25335626
26645120
271242904
282396745
294627915
308948385
3117317888
3233554432
3365076240
34126320640
35245428574
36477218560
37928638035
381808414181
393524068955
406871947672
4113408691175
4226178823218

[1,0,1,1,1,3,4,8,15,24,48,85,155,297,541,1024,
 1935,3626,6912,13107,24940,47709,91136,174760,
 335626,645120,1242904,2396745,4627915,8948385,
 17317888,33554432,65076240,126320640,245428574,
 477218560,928638035,1808414181,3524068955,
 6871947672,13408691175,26178823218]