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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.

A258377 O.g.f. satisfies A^2(z) = 1/(1 - z)*( BINOMIAL(BINOMIAL(A(z))) ).

Table of values

n a(n)
0 1
1 3
2 13
3 79
4 649
5 6955
6 93813
7 1539991
8 29884881
9 669628819
10 17005862301
11 482399018527
12 15108642099673
13 517599894435643
14 19247498583665029
15 771922934908235751
16 33206411983713679009
17 1525025984109289947171
18 74466779211331635306029
19 3852255519421356879419631

List of values

[1, 3, 13, 79, 649, 6955, 93813, 1539991, 29884881, 669628819, 17005862301, 482399018527, 15108642099673, 517599894435643, 19247498583665029, 771922934908235751, 33206411983713679009, 1525025984109289947171, 74466779211331635306029, 3852255519421356879419631]

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

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