Number of elements w of the Weyl group D(n) such that the roots sent negative by w span an Abelian subalgebra of the Lie algebra.
A007851
Number of elements w of the Weyl group D(n) such that the roots sent negative by w span an Abelian subalgebra of the Lie algebra.
Terms
- a(0) =1a(1) =4a(2) =14a(3) =48a(4) =167a(5) =593a(6) =2144a(7) =7864a(8) =29171a(9) =109173a(10) =411501a(11) =1560089a(12) =5943199a(13) =22732739a(14) =87253604a(15) =335897864a(16) =1296447899a(17) =5015206349a(18) =19439895089a(19) =75487384829a(20) =293595204239
External references
- oeis: A007851