Number of rhombuses on a (n+1)X7 grid.

Terms

a(0) =6a(1) =26a(2) =66a(3) =130a(4) =212a(5) =312a(6) =412a(7) =527a(8) =650a(9) =782a(10) =914a(11) =1059a(12) =1204a(13) =1358a(14) =1520a(15) =1691a(16) =1862a(17) =2044a(18) =2226a(19) =2417a(20) =2608a(21) =2808a(22) =3008a(23) =3217a(24) =3430a(25) =3652a(26) =3874a(27) =4105a(28) =4336a(29) =4576