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.

A253221 Number of n X 6 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.

Table of values

n a(n)
1 10
2 49
3 263
4 1249
5 3568
6 3568
7 47698
8 213155
9 538444
10 1039060
11 1719174
12 2579462
13 3619974
14 4840710
15 6241670
16 7822854
17 9584262
18 11525894
19 13647750
20 15949830
21 18432134
22 21094662
23 23937414
24 26960390
25 30163590
26 33547014
27 37110662
28 40854534

List of values

[10, 49, 263, 1249, 3568, 3568, 47698, 213155, 538444, 1039060, 1719174, 2579462, 3619974, 4840710, 6241670, 7822854, 9584262, 11525894, 13647750, 15949830, 18432134, 21094662, 23937414, 26960390, 30163590, 33547014, 37110662, 40854534]