Decuple factorial, 10-factorial, n!10, n!!!!!!!!!!.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =10a(11) =11a(12) =24a(13) =39a(14) =56a(15) =75a(16) =96a(17) =119a(18) =144a(19) =171a(20) =200a(21) =231a(22) =528a(23) =897a(24) =1344a(25) =1875a(26) =2496a(27) =3213a(28) =4032a(29) =4959