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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.

A278840 a(n) = permanent M_n where M_n is the n X n matrix m(i,j) = A000041(i+j).

Table of values

n a(n)
0 1
1 2
2 19
3 642
4 58884
5 13569779
6 6931351962
7 7532494931779
8 16299546505518855
9 67814300022651169814
10 520884812091898994319805
11 7206655416715261673779120809
12 174009567319884878178189603283634
13 7196671016523025599652036668556922867

List of values

[1, 2, 19, 642, 58884, 13569779, 6931351962, 7532494931779, 16299546505518855, 67814300022651169814, 520884812091898994319805, 7206655416715261673779120809, 174009567319884878178189603283634, 7196671016523025599652036668556922867]

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

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