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.

A348700 a(n) = Sum_{x_1+x_2+x_3+x_4=n, 0 <= x_1, x_2, x_3, x_4 <= n} (3*n)!/((n-x_1)! * (n-x_2)! * (n-x_3)! * (n-x_4)!).

Table of values

n a(n)
0 1
1 24
2 1440
3 97440
4 6745200
5 467170704
6 32179283136
7 2201392866816
8 149582010088368
9 10100991172786800
10 678330750569025840
11 45330886561301259360
12 3016323760677017743680
13 199948320909528951802560
14 13210188418741950461761920
15 870202858863529042485373440

List of values

[1, 24, 1440, 97440, 6745200, 467170704, 32179283136, 2201392866816, 149582010088368, 10100991172786800, 678330750569025840, 45330886561301259360, 3016323760677017743680, 199948320909528951802560, 13210188418741950461761920, 870202858863529042485373440]