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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.

A303203 Number of permutations p of [2n+1] such that 0p has a nonincreasing jump sequence beginning with n+1.

Table of values

n a(n)
0 1
1 2
2 12
3 98
4 988
5 10872
6 129520
7 1609176
8 20786804
9 274792342
10 3719296036
11 51119572738
12 712918642042
13 10055531355652
14 143287150725298
15 2058368140071146
16 29796314629826814
17 434051906728752164
18 6359063811707227298
19 93635249115751389952
20 1385028309353547034876

List of values

[1, 2, 12, 98, 988, 10872, 129520, 1609176, 20786804, 274792342, 3719296036, 51119572738, 712918642042, 10055531355652, 143287150725298, 2058368140071146, 29796314629826814, 434051906728752164, 6359063811707227298, 93635249115751389952, 1385028309353547034876]

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

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