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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.

A054919 Number of nonisomorphic connected unlabeled binary relations on n nodes.

Table of values

n a(n)
0 1
1 2
2 7
3 86
4 2818
5 285382
6 96324549
7 112087100482
8 458071928280897
9 6665704296529088252
10 349377209492194571020053
11 66602723163954144515240479674
12 46557323273646194397778583902876038
13 120168498151800396724425973133360413846262
14 1152049915423012273792614840793828654424980146983

List of values

[1, 2, 7, 86, 2818, 285382, 96324549, 112087100482, 458071928280897, 6665704296529088252, 349377209492194571020053, 66602723163954144515240479674, 46557323273646194397778583902876038, 120168498151800396724425973133360413846262, 1152049915423012273792614840793828654424980146983]

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

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