12-gonal (or dodecagonal) pyramidal numbers: a(n) = n*(n+1)*(10*n-7)/6.

Terms

a(0) =0a(1) =1a(2) =13a(3) =46a(4) =110a(5) =215a(6) =371a(7) =588a(8) =876a(9) =1245a(10) =1705a(11) =2266a(12) =2938a(13) =3731a(14) =4655a(15) =5720a(16) =6936a(17) =8313a(18) =9861a(19) =11590a(20) =13510a(21) =15631a(22) =17963a(23) =20516a(24) =23300a(25) =26325a(26) =29601a(27) =33138a(28) =36946a(29) =41035