11-dimensional centered tetrahedral numbers.

Terms

a(0) =1a(1) =13a(2) =91a(3) =455a(4) =1820a(5) =6188a(6) =18564a(7) =50388a(8) =125970a(9) =293930a(10) =646646a(11) =1352078a(12) =2704155a(13) =5200287a(14) =9657609a(15) =17383405a(16) =30419935a(17) =51889747a(18) =86474661a(19) =141070137a(20) =225666870a(21) =354523390a(22) =547707394a(23) =833099722