P-递归:
n^2*(3*n-1)*(3*n-2)*(3*n-3)*(143*n^4-891*n^3+2080*n^2-2154*n+834)*a(n)=(n-1)*(83941*n^8-690899*n^7+2387290*n^6-4496969*n^5+5024203*n^4-3396638*n^3+1355652*n^2-292104*n+25920)*a(n-1)-9*(n-2)*(3*n-4)^2*(3*n-5)^2*(143*n^4-319*n^3+265*n^2-95*n+12)*a(n-2),其中a(0)=1,a(1)=3。