Number of rectangles in a pyramid built with squares. The squares counted in A092498 are excluded.

Terms

a(0) =0a(1) =4a(2) =19a(3) =57a(4) =134a(5) =269a(6) =486a(7) =813a(8) =1281a(9) =1926a(10) =2788a(11) =3910a(12) =5340a(13) =7130a(14) =9335a(15) =12015a(16) =15234a(17) =19059a(18) =23562a(19) =28819a(20) =34909a(21) =41916a(22) =49928a(23) =59036a(24) =69336a(25) =80928a(26) =93915a(27) =108405a(28) =124510a(29) =142345