a(n) = n*(n + 7)*(n + 14)*(n + 21)/24.

Terms

a(0) =0a(1) =110a(2) =276a(3) =510a(4) =825a(5) =1235a(6) =1755a(7) =2401a(8) =3190a(9) =4140a(10) =5270a(11) =6600a(12) =8151a(13) =9945a(14) =12005a(15) =14355a(16) =17020a(17) =20026a(18) =23400a(19) =27170a(20) =31365a(21) =36015a(22) =41151a(23) =46805a(24) =53010a(25) =59800a(26) =67210a(27) =75276a(28) =84035a(29) =93525