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.

A125910 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 2,3,4 and at least one of digits 5,6,7,8,9.

Table of values

n a(n)
1 9
2 81
3 723
4 6381
5 55539
6 475461
7 3993243
8 32857101
9 264890019
10 2094889941
11 16282118763
12 124625344221
13 941303216499
14 7029057066021
15 51980086628283
16 381227207181741
17 2776407821318979
18 20100192515299701
19 144786930345697803
20 1038495372200033661

List of values

[9, 81, 723, 6381, 55539, 475461, 3993243, 32857101, 264890019, 2094889941, 16282118763, 124625344221, 941303216499, 7029057066021, 51980086628283, 381227207181741, 2776407821318979, 20100192515299701, 144786930345697803, 1038495372200033661]