login

A221766 as a simple table

na(n)
10
221
3536
412177
5296912
67115200
7170234678
84073986651
997465620298
102331545530294
1155772599075464
121334104002498388
1331912076109370226
14763341593404141513
1518259216025036326102
16436762191877943225707

[0,21,536,12177,296912,7115200,170234678,
 4073986651,97465620298,2331545530294,
 55772599075464,1334104002498388,31912076109370226,
 763341593404141513,18259216025036326102,
 436762191877943225707]