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.

A222381 Sum of neighbor maps: number of n X 2 binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal and antidiagonal neighbors in a random 0..2 n X 2 array.

Table of values

n a(n)
1 2
2 16
3 64
4 232
5 1024
6 4096
7 16224
8 65536
9 262144
10 1047680
11 4194304
12 16777216
13 67104256
14 268435456
15 1073741824
16 4294944768
17 17179869184
18 68719476736
19 274877800448
20 1099511627776
21 4398046511104
22 17592185552896
23 70368744177664

List of values

[2, 16, 64, 232, 1024, 4096, 16224, 65536, 262144, 1047680, 4194304, 16777216, 67104256, 268435456, 1073741824, 4294944768, 17179869184, 68719476736, 274877800448, 1099511627776, 4398046511104, 17592185552896, 70368744177664]