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A029701 Number of lines on the intersection of two general hypersurfaces of degree n in complex projective (n+2)-space. 0
1, 16, 1053, 111616, 19188125, 4782986496, 1636365422153, 735546407124992, 420472391422517289, 297915693945728000000, 256254423319439013201029, 263056604016582698937090048, 317691429498449659489885141925 (list; graph; refs; listen; history; text; internal format)
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: A180376 A162008 A195619 * A281984 A266066 A232571

Adjacent sequences:  A029698 A029699 A029700 * A029702 A029703 A029704

KEYWORD

nonn,easy

AUTHOR

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

STATUS

approved

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Last modified October 16 21:10 EDT 2019. Contains 328103 sequences. (Running on oeis4.)