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.

A291780 Consider the Watanabe tag system defined in A291067; a(n) = number of binary words of length n which terminate at the empty word.

Table of values

n a(n)
1 2
2 4
3 4
4 4
5 16
6 32
7 64
8 128
9 128
10 320
11 1152
12 1792
13 3584
14 8704
15 16384
16 28672
17 65536
18 118784
19 221184
20 483328
21 851968
22 1720320
23 3866624
24 6815744
25 14483456
26 31719424
27 55574528
28 113770496
29 246939648
30 438304768
31 837812224
32 1790967808
33 3309305856

List of values

[2, 4, 4, 4, 16, 32, 64, 128, 128, 320, 1152, 1792, 3584, 8704, 16384, 28672, 65536, 118784, 221184, 483328, 851968, 1720320, 3866624, 6815744, 14483456, 31719424, 55574528, 113770496, 246939648, 438304768, 837812224, 1790967808, 3309305856]

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

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