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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.

A355219 a(n) = Sum_{k>=1} (4*k - 2)^n / 2^k.

Table of values

n a(n)
0 1
1 6
2 68
3 1176
4 27152
5 783456
6 27126848
7 1095801216
8 50589024512
9 2627443262976
10 151623974601728
11 9624874873952256
12 666516443992297472
13 50002158357801885696
14 4039720490206565777408
15 349685083067909962039296
16 32287291853754803207340032
17 3167488677197974581176303616

List of values

[1, 6, 68, 1176, 27152, 783456, 27126848, 1095801216, 50589024512, 2627443262976, 151623974601728, 9624874873952256, 666516443992297472, 50002158357801885696, 4039720490206565777408, 349685083067909962039296, 32287291853754803207340032, 3167488677197974581176303616]

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

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