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.
%I A244522 #8 Jul 22 2014 02:38:21 %S A244522 1,1,2,0,0,2,4,10,36,126,454,1744,6892,28486,120962,531660,2398248, %T A244522 11127674,52888998,257570104,1282439216 %N A244522 Number of simple involutions of length n. %e A244522 The a(7) = 10 simple involutions are: %e A244522 01: [ 5 1 4 6 2 0 3 ] (0, 5) (1) (2, 4) (3, 6) %e A244522 02: [ 4 1 6 3 0 5 2 ] (0, 4) (1) (2, 6) (3) (5) %e A244522 03: [ 4 6 2 5 0 3 1 ] (0, 4) (1, 6) (2) (3, 5) %e A244522 04: [ 5 3 6 1 4 0 2 ] (0, 5) (1, 3) (2, 6) (4) %e A244522 05: [ 3 1 5 0 6 2 4 ] (0, 3) (1) (2, 5) (4, 6) %e A244522 06: [ 3 5 2 0 6 1 4 ] (0, 3) (1, 5) (2) (4, 6) %e A244522 07: [ 3 6 4 0 2 5 1 ] (0, 3) (1, 6) (2, 4) (5) %e A244522 08: [ 2 5 0 3 6 1 4 ] (0, 2) (1, 5) (3) (4, 6) %e A244522 09: [ 2 5 0 6 4 1 3 ] (0, 2) (1, 5) (3, 6) (4) %e A244522 10: [ 2 4 0 6 1 5 3 ] (0, 2) (1, 4) (3, 6) (5) %Y A244522 Cf. A000085 (involutions), A111111 (simple permutations). %K A244522 nonn,more %O A244522 0,3 %A A244522 _Joerg Arndt_ and _Jay Pantone_, Jul 21 2014