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.

A126631 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 and at least one of digits 6,7,8,9.

Table of values

n a(n)
1 9
2 77
3 633
4 5021
5 38409
6 283277
7 2019033
8 13963901
9 94144809
10 621444077
11 4031587833
12 25787305181
13 163054382409
14 1021372934477
15 6349128459033
16 39222102764861
17 241061530639209
18 1475385002210477
19 8998880800344633
20 54732125638998941

List of values

[9, 77, 633, 5021, 38409, 283277, 2019033, 13963901, 94144809, 621444077, 4031587833, 25787305181, 163054382409, 1021372934477, 6349128459033, 39222102764861, 241061530639209, 1475385002210477, 8998880800344633, 54732125638998941]