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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.

A306381 a(n) is the number of semimagic 4 X 3 matrices whose entries are nonnegative integers, with row sum = 3*n and column sum = 4*n.

Table of values

n a(n)
0 1
1 415
2 8623
3 64405
4 289981
5 965071
6 2626975
7 6195673
8 13123945
9 25572511
10 46610191
11 80439085
12 132644773
13 210471535
14 323122591
15 482085361
16 701481745
17 998443423
18 1393512175
19 1911065221
20 2579765581
21 3433037455
22 4509566623
23 5853825865
24 7516625401
25 9555688351

List of values

[1, 415, 8623, 64405, 289981, 965071, 2626975, 6195673, 13123945, 25572511, 46610191, 80439085, 132644773, 210471535, 323122591, 482085361, 701481745, 998443423, 1393512175, 1911065221, 2579765581, 3433037455, 4509566623, 5853825865, 7516625401, 9555688351]

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

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