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A047760 as a simple table

na(n)
10
20
31
40
51
60
73
80
95
100
1112
120
1323
140
1555
160
17114
180
19273
200
21588
220
231428
240
253156
260
277752
280
2917427
300
3143263
320
3398516
340
35246675
360
37567281
380
391430715
400
413316521
420
438414640
440
4519633796
460
4750067108
480
49117464424
500
51300830572
520
53709098696

[0,0,1,0,1,0,3,0,5,0,12,0,23,0,55,0,114,0,273,0,
 588,0,1428,0,3156,0,7752,0,17427,0,43263,0,98516,
 0,246675,0,567281,0,1430715,0,3316521,0,8414640,0,
 19633796,0,50067108,0,117464424,0,300830572,0,
 709098696]