Number of (w,x,y,z) with all terms in {1,...,n} and w > (geometric mean of x,y,z).

Terms

a(0) =0a(1) =0a(2) =7a(3) =42a(4) =135a(5) =340a(6) =717a(7) =1332a(8) =2281a(9) =3657a(10) =5604a(11) =8224a(12) =11676a(13) =16113a(14) =21712a(15) =28656a(16) =37122a(17) =47368a(18) =59583a(19) =74049a(20) =90988a(21) =110667a(22) =133368a(23) =159394a(24) =189084a(25) =222681a(26) =260635a(27) =303210a(28) =350841a(29) =403846