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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.

A206239 Subsequence A005318(t_n), where t_n is the n-th triangular number (A000217).

Table of values

n a(n)
1 0
2 1
3 4
4 24
5 309
6 8807
7 530356
8 65679652
9 16512273616
10 8370804628178
11 8525389679187197
12 17408681737224080093
13 71192609533782031405771
14 582711051458083440858730497
15 9542765396943645975520145941300
16 312620974584432225019935558843189172
17 20485270547000003746699189223065768145956

List of values

[0, 1, 4, 24, 309, 8807, 530356, 65679652, 16512273616, 8370804628178, 8525389679187197, 17408681737224080093, 71192609533782031405771, 582711051458083440858730497, 9542765396943645975520145941300, 312620974584432225019935558843189172, 20485270547000003746699189223065768145956]

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

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