OFFSET
0,2
LINKS
J. Agapito, On symmetric polynomials with only real zeros and nonnegative gamma-vectors, Linear Algebra and its Applications, Volume 451, 15 June 2014, Pages 260-289.
FORMULA
a(n) = (n+3)!*(n+2)!*(n+1)!*n!/12, n>=0. 12=A000178(3) (superfactorial).
PROG
(PARI) a(n) = (n+3)!*(n+2)!*(n+1)!*n!/12; \\ Michel Marcus, Feb 12 2019
(Python)
from math import factorial
def A090444(n): return factorial(n)**4*(n+3)*(n+2)**2*(n+1)**3//12 # Chai Wah Wu, Apr 22 2024
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Dec 23 2003
STATUS
approved