login

A221087 as a simple table

na(n)
10
21
30
42
54
60
74
824
916
100
118
12169
13270
1464
150
1616
171155
186889
193024
20256
210
2232
237921
24154440
25279841
2633858
271024
280
2964
3054288
313538161
3220489472
3311363641
34379080
354096
360
37128
38372100
3980655102
401572836281
412714713664
42461433361
434244238

[0,1,0,2,4,0,4,24,16,0,8,169,270,64,0,16,1155,
 6889,3024,256,0,32,7921,154440,279841,33858,1024,
 0,64,54288,3538161,20489472,11363641,379080,4096,
 0,128,372100,80655102,1572836281,2714713664,
 461433361,4244238]