Number of possible games of 10-pin bowling with a total score of n.

Terms

a(0) =1a(1) =20a(2) =210a(3) =1540a(4) =8855a(5) =42504a(6) =177100a(7) =657800a(8) =2220075a(9) =6906900a(10) =20030010a(11) =54627084a(12) =141116637a(13) =347336412a(14) =818558424a(15) =1854631380a(16) =4053948342a(17) =8574134256a(18) =17590903116a(19) =35084425512a(20) =68153183370a(21) =129156542039