One less than number of n-multisets chosen from a 10-set.

Terms

a(0) =0a(1) =9a(2) =54a(3) =219a(4) =714a(5) =2001a(6) =5004a(7) =11439a(8) =24309a(9) =48619a(10) =92377a(11) =167959a(12) =293929a(13) =497419a(14) =817189a(15) =1307503a(16) =2042974a(17) =3124549a(18) =4686824a(19) =6906899a(20) =10015004a(21) =14307149a(22) =20160074a(23) =28048799a(24) =38567099a(25) =52451255a(26) =70607459a(27) =94143279