Number of rhombuses on a (n+1)X9 grid.

Terms

a(0) =8a(1) =39a(2) =100a(3) =204a(4) =344a(5) =527a(6) =736a(7) =984a(8) =1244a(9) =1520a(10) =1796a(11) =2104a(12) =2412a(13) =2736a(14) =3076a(15) =3438a(16) =3800a(17) =4184a(18) =4568a(19) =4968a(20) =5376a(21) =5800a(22) =6224a(23) =6668a(24) =7120a(25) =7588a(26) =8056a(27) =8540a(28) =9024a(29) =9524