Number of decimal numbers having n or fewer digits and having the sum of their digits equal to n.
A167403
Number of decimal numbers having n or fewer digits and having the sum of their digits equal to n.
Terms
- a(0) =1a(1) =3a(2) =10a(3) =35a(4) =126a(5) =462a(6) =1716a(7) =6435a(8) =24310a(9) =92368a(10) =352595a(11) =1351142a(12) =5194385a(13) =20024980a(14) =77384340a(15) =299671971a(16) =1162635441a(17) =4518099300a(18) =17583582225a(19) =68522664400a(20) =267350823015
External references
- oeis: A167403