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.

A367243 a(n) is the number of n-digit numbers whose difference between the largest and smallest digits is equal to 2.

Table of values

n a(n)
1 0
2 15
3 91
4 381
5 1375
6 4605
7 14791
8 46341
9 142975
10 436845
11 1326391
12 4010901
13 12096175
14 36415485
15 109500391
16 329009061
17 988042975
18 2966160525
19 8902544791
20 26715760821
21 80163535375
22 240523111965
23 721634347591
24 2165033066181
25 6495359245375
26 19486597829805
27 58460833676791

List of values

[0, 15, 91, 381, 1375, 4605, 14791, 46341, 142975, 436845, 1326391, 4010901, 12096175, 36415485, 109500391, 329009061, 988042975, 2966160525, 8902544791, 26715760821, 80163535375, 240523111965, 721634347591, 2165033066181, 6495359245375, 19486597829805, 58460833676791]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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