login

A240688 as a simple table

na(n)
01
11
25
319
481
5351
61553
76959
831489
9143551
10658305
113033471
1214034177
1365147135
14303285505
151415422719
166620053505
1731021657087
18145613977601
19684537354239
203222408929281
2115187861143551
2271663163121665

[1,1,5,19,81,351,1553,6959,31489,143551,658305,
 3033471,14034177,65147135,303285505,1415422719,
 6620053505,31021657087,145613977601,684537354239,
 3222408929281,15187861143551,71663163121665]