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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.

A209245 Main diagonal of the triple recurrence x(i,j,k) = x(i-1,j,k) + x(i,j-1,k) + x(i,j,k-1) with x(i,j,k) = 1 if 0 in {i,j,k}.

Table of values

n a(n)
0 1
1 3
2 33
3 543
4 10497
5 220503
6 4870401
7 111243135
8 2602452993
9 61985744967
10 1497148260033
11 36566829737727
12 901314269530113
13 22385640256615743
14 559574590912019457
15 14065064484334380543
16 355222860485671141377
17 9008982166319523972903
18 229325469394627488082497

List of values

[1, 3, 33, 543, 10497, 220503, 4870401, 111243135, 2602452993, 61985744967, 1497148260033, 36566829737727, 901314269530113, 22385640256615743, 559574590912019457, 14065064484334380543, 355222860485671141377, 9008982166319523972903, 229325469394627488082497]

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

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