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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.

A279296 Number of permutations of [n] having exactly seven (possibly overlapping) doubledescents.

Table of values

n a(n)
9 1
10 18
11 2195
12 57980
13 2234121
14 62821766
15 1877987735
16 52129260840
17 1462714640951
18 40503784352590
19 1131481211125461
20 31802909031355052
21 905596491625548929
22 26146644212681105382
23 767446589270204991395
24 22921754812832515642328
25 697455004277912572544814

List of values

[1, 18, 2195, 57980, 2234121, 62821766, 1877987735, 52129260840, 1462714640951, 40503784352590, 1131481211125461, 31802909031355052, 905596491625548929, 26146644212681105382, 767446589270204991395, 22921754812832515642328, 697455004277912572544814]

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

Content is available under The OEIS End-User License Agreement.