222625domain: NAppears in sequencesa(n) = 2*n^4 + 2*n^3 + 3*n^2 + 2*n + 1.at n=18A058920a(n) = 5*a(n-1) + 20*a(n-2), n>2 ; a(0)=1, a(1)=1, a(2)=9.at n=7A154996G.f.: Sum_{n>=0} Product_{k=1..n} (q^k - 1) where q = (1-x^3)/(1-x).at n=8A207433Number of (w,x,y,z) with all terms in {1,...,n} and w+x<y+z.at n=26A212523