A155621 - OEIS

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A155621 as a simple table

n	a(n)
0	1
1	13
2	115
3	1063
4	10255
5	101023
6	1004095
7	10016383
8	100065535
9	1000262143
10	10001048575
11	100004194303
12	1000016777215
13	10000067108863
14	100000268435455
15	1000001073741823
16	10000004294967295
17	100000017179869183

[1,13,115,1063,10255,101023,1004095,10016383, 100065535,1000262143,10001048575,100004194303, 1000016777215,10000067108863,100000268435455, 1000001073741823,10000004294967295, 100000017179869183]