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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.

A322247 a(n) = A322246(n)^2, the square of the central coefficient in (1 + 5*x + 9*x^2)^n.

Table of values

n a(n)
0 1
1 25
2 1849
3 156025
4 14523721
5 1426950625
6 145317252025
7 15178231605625
8 1615509001626025
9 174471431239950625
10 19062335608125901729
11 2102483602307417980225
12 233721380163477368733481
13 26154175972512598202392225
14 2943361280244176889333396889
15 332869229155486455718147125625
16 37806108834415039621850996946025
17 4310099976506176089944803738530625
18 493021434686696395739629566004713025

List of values

[1, 25, 1849, 156025, 14523721, 1426950625, 145317252025, 15178231605625, 1615509001626025, 174471431239950625, 19062335608125901729, 2102483602307417980225, 233721380163477368733481, 26154175972512598202392225, 2943361280244176889333396889, 332869229155486455718147125625, 37806108834415039621850996946025, 4310099976506176089944803738530625, 493021434686696395739629566004713025]

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

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