A013700 Degree of variety K_{2,n}^3.

1, 128, 6765, 265720, 9112264, 290926848, 8916942687, 266668876540, 7853149169635, 228982270335000, 6632994268595136, 191292945772217856, 5500214758962096400, 157819424038439232000, 4521902974531722618723

Offset

1,2

Links

Table of n, a(n) for n=1..15.

M. S. Ravi et al., Dynamic pole assignment and Schubert calculus, SIAM J. Control Optimization, 34 (1996), 813-832, esp. p. 825.

Prog

(PARI) K(n, q=3)=(2*n+n*q+2*q)!*sum(j=0, q, ((q-2*j)*(n+2)+1)/(n+j*(n+2))!/(n+1+(q-j)*(n+2))!)

Crossrefs

Cf. A013698 (q=1), A013699 (q=2), A013701 (q=4), A013702 (q=5).

Sequence in context: A283690 A008791 A201239 * A232995 A283281 A181242

Adjacent sequences: A013697 A013698 A013699 * A013701 A013702 A013703

Keyword

nonn,easy

Author

Joachim.Rosenthal(AT)nd.edu (Joachim Rosenthal)

Extensions

Edited by Ralf Stephan, May 13 2003

Status

approved