11-gonal (or hendecagonal) pyramidal numbers: a(n) = n*(n+1)*(3*n-2)/2.

Terms

a(0) =0a(1) =1a(2) =12a(3) =42a(4) =100a(5) =195a(6) =336a(7) =532a(8) =792a(9) =1125a(10) =1540a(11) =2046a(12) =2652a(13) =3367a(14) =4200a(15) =5160a(16) =6256a(17) =7497a(18) =8892a(19) =10450a(20) =12180a(21) =14091a(22) =16192a(23) =18492a(24) =21000a(25) =23725a(26) =26676a(27) =29862a(28) =33292a(29) =36975