A029701 Number of lines on the intersection of two general hypersurfaces of degree n in complex projective (n+2)-space.

1, 16, 1053, 111616, 19188125, 4782986496, 1636365422153, 735546407124992, 420472391422517289, 297915693945728000000, 256254423319439013201029, 263056604016582698937090048, 317691429498449659489885141925

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Formula

Coefficient of x^(n+2)*y^(n+1) in the polynomial (x-y)*product((k*x+(n-k)*y)^2, k=0..n)

Crossrefs

Sequence in context: A332471 A195619 A348862 * A281984 A266066 A232571

Adjacent sequences: A029698 A029699 A029700 * A029702 A029703 A029704

Keyword

nonn,easy

Author

Paolo Dominici (pl.dm(AT)libero.it)

Status

approved