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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.

A322245 a(n) = A322244(n)^2, the square of the central coefficient in (1 + 3*x + 16x^2)^n.

Table of values

n a(n)
0 1
1 9
2 1681
3 99225
4 11189025
5 1019077929
6 108167974321
7 11137724806329
8 1197175570050625
9 129043286745662025
10 14139849178569444561
11 1560056939689534791129
12 173632800433761049827681
13 19441545948416137605093225
14 2189471746316530595782640625
15 247739375533243457859858956025
16 28151322919072607132343448452225
17 3210745922813847247161044673062025

List of values

[1, 9, 1681, 99225, 11189025, 1019077929, 108167974321, 11137724806329, 1197175570050625, 129043286745662025, 14139849178569444561, 1560056939689534791129, 173632800433761049827681, 19441545948416137605093225, 2189471746316530595782640625, 247739375533243457859858956025, 28151322919072607132343448452225, 3210745922813847247161044673062025]

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

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