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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.

A187462 T(n,k)=Number of (n+1)X(n+1) 0..k arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.

Table of values

n a(n)
1 6
2 50
3 26
4 192
5 1236
6 144
7 512
8 13726
9 89618
10 1272
11 1126
12 84048
13 5098224
14 11684688
15 15192
16 2146
17 325932
18 100936174
19 3387715318
20 6112320620
21 286392
22 3760
23 1118854
24 1061948616
25 216668424092
26 19708386669940
27 4871877392202
28 7648032
29 6112

List of values

[6, 50, 26, 192, 1236, 144, 512, 13726, 89618, 1272, 1126, 84048, 5098224, 11684688, 15192, 2146, 325932, 100936174, 3387715318, 6112320620, 286392, 3760, 1118854, 1061948616, 216668424092, 19708386669940, 4871877392202, 7648032, 6112]

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

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