Symmetric triangle, read by rows, where row n equals the (n+1)-th differences of the crystal ball sequence for D_n lattice, for n>=0.
A108558
Symmetric triangle, read by rows, where row n equals the (n+1)-th differences of the crystal ball sequence for D_n lattice, for n>=0.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =9a(8) =9a(9) =1a(10) =1a(11) =20a(12) =54a(13) =20a(14) =1a(15) =1a(16) =35a(17) =180a(18) =180a(19) =35a(20) =1a(21) =1a(22) =54a(23) =447a(24) =852a(25) =447a(26) =54a(27) =1a(28) =1a(29) =77
External references
- oeis: A108558