login

A068031 as a simple table

na(n)
01
11
21
31
42
54
67
713
826
952
10104
11206
12410
13820
141640
153280
166556
1713108
1826216
1952432
20104864
21209720
22419432
23838864
241677728
253355456
266710896
2713421776
2826843552
2953687104
30107374208
31214748384
32429496736
33858993472
341717986944

[1,1,1,1,2,4,7,13,26,52,104,206,410,820,1640,3280,
 6556,13108,26216,52432,104864,209720,419432,
 838864,1677728,3355456,6710896,13421776,26843552,
 53687104,107374208,214748384,429496736,858993472,
 1717986944]