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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.

A386765 a(n) = Sum_{k=0..n} 5^k * 3^(n-k) * binomial(3*n+k-1,k).

Table of values

n a(n)
0 1
1 18
2 624
3 24432
4 1008876
5 42927318
6 1862060124
7 81862383432
8 3634739070876
9 162615605774568
10 7319222860673124
11 331046648931192432
12 15033834910528707876
13 685059700337659528068
14 31307482174782491223624
15 1434354449577159551751432
16 65858845473746133806094876

List of values

[1, 18, 624, 24432, 1008876, 42927318, 1862060124, 81862383432, 3634739070876, 162615605774568, 7319222860673124, 331046648931192432, 15033834910528707876, 685059700337659528068, 31307482174782491223624, 1434354449577159551751432, 65858845473746133806094876]

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

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