login

A000740 as a simple table

na(n)
11
21
33
46
515
627
763
8120
9252
10495
111023
122010
134095
148127
1516365
1632640
1765535
18130788
19262143
20523770
211048509
222096127
234194303
248386440
2516777200
2633550335
2767108608
28134209530
29268435455
30536854005
311073741823
322147450880

[1,1,3,6,15,27,63,120,252,495,1023,2010,4095,8127,
 16365,32640,65535,130788,262143,523770,1048509,
 2096127,4194303,8386440,16777200,33550335,
 67108608,134209530,268435455,536854005,1073741823,
 2147450880]