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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.

A308294 a(n) = Sum_{i_1=0..3} Sum_{i_2=0..3} ... Sum_{i_n=0..3} multinomial(i_1+i_2+...+i_n; i_1, i_2, ... , i_n).

Table of values

n a(n)
0 1
1 4
2 69
3 5248
4 1107697
5 492911196
6 396643610629
7 522506795651464
8 1050188527130093313
9 3055485688346936896372
10 12353356560641179964896741
11 67171925010307462937573055504
12 478268992794023738033117638364209
13 4360663458863998067849091605547380428

List of values

[1, 4, 69, 5248, 1107697, 492911196, 396643610629, 522506795651464, 1050188527130093313, 3055485688346936896372, 12353356560641179964896741, 67171925010307462937573055504, 478268992794023738033117638364209, 4360663458863998067849091605547380428]

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

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