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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.

A361890 a(n) = S(7,n), where S(r,n) = Sum_{k = 0..floor(n/2)} ( binomial(n,k) - binomial(n,k-1) )^r.

Table of values

n a(n)
0 1
1 1
2 2
3 129
4 2316
5 94510
6 4939220
7 211106945
8 14879165560
9 828070125876
10 61472962084968
11 4223017425122958
12 325536754765395096
13 25399546083773839692
14 2059386837863675003112
15 173281152533121109073025
16 14789443838781868027714800
17 1307994690673355979749969800

List of values

[1, 1, 2, 129, 2316, 94510, 4939220, 211106945, 14879165560, 828070125876, 61472962084968, 4223017425122958, 325536754765395096, 25399546083773839692, 2059386837863675003112, 173281152533121109073025, 14789443838781868027714800, 1307994690673355979749969800]

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

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