9-dimensional centered tetrahedral numbers.

Terms

a(0) =1a(1) =11a(2) =66a(3) =286a(4) =1001a(5) =3003a(6) =8008a(7) =19448a(8) =43758a(9) =92378a(10) =184755a(11) =352705a(12) =646580a(13) =1143780a(14) =1960255a(15) =3265757a(16) =5303727a(17) =8416837a(18) =13079352a(19) =19937632a(20) =29860259a(21) =43999449a(22) =63865594a(23) =91416974