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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.

A335649 a(n) is the frequency of multi-pairs in a sequence of multi-set designs with 2 blocks.

Table of values

n a(n)
1 0
2 10
3 200
4 3040
5 43320
6 607050
7 8468880
8 118007680
9 1643826800
10 22896269770
11 318906570840
12 4441805503200
13 61866406977960
14 861688028423050
15 12001766499380000
16 167163044860403200
17 2328280868627854560
18 32428769142358413450
19 451674487223023755240
20 6291014052348080593120

List of values

[0, 10, 200, 3040, 43320, 607050, 8468880, 118007680, 1643826800, 22896269770, 318906570840, 4441805503200, 61866406977960, 861688028423050, 12001766499380000, 167163044860403200, 2328280868627854560, 32428769142358413450, 451674487223023755240, 6291014052348080593120]

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

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