cp's OEIS Frontend

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.

A102620 Number of legal Go positions on a 1 X n board (for which 3^n is a trivial upper bound).

Table of values

n a(n)
1 1
2 5
3 15
4 41
5 113
6 313
7 867
8 2401
9 6649
10 18413
11 50991
12 141209
13 391049
14 1082929
15 2998947
16 8304961
17 22998865
18 63690581
19 176377839
20 488441801
21 1352638145
22 3745850473
23 10373355075
24 28726852897
25 79553054089
26 220305664445
27 610090792143
28 1689519766073
29 4678774170521
30 12956893537633
31 35881426208451
32 99366159258241
33 275173945103905
34 762037102261925
35 2110303520940111

List of values

[1, 5, 15, 41, 113, 313, 867, 2401, 6649, 18413, 50991, 141209, 391049, 1082929, 2998947, 8304961, 22998865, 63690581, 176377839, 488441801, 1352638145, 3745850473, 10373355075, 28726852897, 79553054089, 220305664445, 610090792143, 1689519766073, 4678774170521, 12956893537633, 35881426208451, 99366159258241, 275173945103905, 762037102261925, 2110303520940111]

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

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