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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.

A257666 Number of ways of placing n balls into boxes 1,2,... in such a way that any two adjacent boxes contain at least 4 balls.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 7
5 11
6 17
7 25
8 51
9 94
10 165
11 280
12 496
13 887
14 1576
15 2770
16 4880
17 8630
18 15276
19 26990
20 47656
21 84183
22 148781
23 262921
24 464528
25 820699
26 1450091
27 2562250
28 4527272
29 7999104
30 14133456
31 24972396
32 44123768
33 77962003
34 137750326
35 243390090
36 430044755
37 759843749

List of values

[1, 1, 1, 1, 7, 11, 17, 25, 51, 94, 165, 280, 496, 887, 1576, 2770, 4880, 8630, 15276, 26990, 47656, 84183, 148781, 262921, 464528, 820699, 1450091, 2562250, 4527272, 7999104, 14133456, 24972396, 44123768, 77962003, 137750326, 243390090, 430044755, 759843749]

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

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