cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A126632 a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks the digit 1, at least one of digits 2,3, at least one of digits 4,5,6 and at least one of digits 7,8,9.

Table of values

n a(n)
1 9
2 79
3 669
4 5431
5 42189
6 314119
7 2251629
8 15625591
9 105563469
10 697683559
11 4529641389
12 28986744151
13 183339095949
14 1148652643399
15 7141191155949
16 44118519949111
17 271168742599629
18 1659705919705639
19 10123331198091309
20 61571999920648471

List of values

[9, 79, 669, 5431, 42189, 314119, 2251629, 15625591, 105563469, 697683559, 4529641389, 28986744151, 183339095949, 1148652643399, 7141191155949, 44118519949111, 271168742599629, 1659705919705639, 10123331198091309, 61571999920648471]