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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.

A244755 a(n) = Sum_{k=0..n} C(n,k) * (1 + 3^k)^(n-k).

Table of values

n a(n)
0 1
1 3
2 13
3 87
4 985
5 19563
6 697573
7 44195007
8 4985202865
9 987432857043
10 344306650353853
11 209169206074748967
12 222262777197258910345
13 409907753371580011362363
14 1317924525238880964004945813
15 7341603216747343890845790989967
16 71176841502529490992224798115792225

List of values

[1, 3, 13, 87, 985, 19563, 697573, 44195007, 4985202865, 987432857043, 344306650353853, 209169206074748967, 222262777197258910345, 409907753371580011362363, 1317924525238880964004945813, 7341603216747343890845790989967, 71176841502529490992224798115792225]

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

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