Number of (w,x,y,z) with all terms in {1,...,n} and w + x > 2y + 2z.

Terms

a(0) =0a(1) =0a(2) =0a(3) =3a(4) =16a(5) =48a(6) =114a(7) =229a(8) =416a(9) =696a(10) =1100a(11) =1655a(12) =2400a(13) =3368a(14) =4606a(15) =6153a(16) =8064a(17) =10384a(18) =13176a(19) =16491a(20) =20400a(21) =24960a(22) =30250a(23) =36333a(24) =43296a(25) =51208a(26) =60164a(27) =70239a(28) =81536a(29) =94136