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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.

A277405 a(n) equals the constant term in the sum of all permutations of compositions of functions (1 + k*x) for k=1..n.

Table of values

n a(n)
1 1
2 5
3 40
4 524
5 10776
6 327732
7 13920096
8 788050944
9 57348311040
10 5215111879680
11 579420628853760
12 77220215372770560
13 12157472554474222080
14 2232192933566250681600
15 472721150641130889523200
16 114371049117960857921126400
17 31350167446592485414541721600
18 9664519305841281076219121664000
19 3328880054333616589332111409152000
20 1273663039174670323519439513960448000

List of values

[1, 5, 40, 524, 10776, 327732, 13920096, 788050944, 57348311040, 5215111879680, 579420628853760, 77220215372770560, 12157472554474222080, 2232192933566250681600, 472721150641130889523200, 114371049117960857921126400, 31350167446592485414541721600, 9664519305841281076219121664000, 3328880054333616589332111409152000, 1273663039174670323519439513960448000]

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

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