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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.

A330796 a(n) = Sum_{k=0..n} binomial(n, k)*(2^k - binomial(k, floor(k/2))).

Table of values

n a(n)
0 0
1 1
2 4
3 14
4 46
5 147
6 462
7 1437
8 4438
9 13637
10 41746
11 127426
12 388076
13 1179739
14 3581052
15 10856790
16 32880942
17 99496293
18 300845658
19 909073356
20 2745419352
21 8287110075
22 25003877784
23 75412396575
24 227366950140
25 685293578217
26 2064924137152
27 6220442229932
28 18734334462598

List of values

[0, 1, 4, 14, 46, 147, 462, 1437, 4438, 13637, 41746, 127426, 388076, 1179739, 3581052, 10856790, 32880942, 99496293, 300845658, 909073356, 2745419352, 8287110075, 25003877784, 75412396575, 227366950140, 685293578217, 2064924137152, 6220442229932, 18734334462598]

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

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