10-gonal (or decagonal) pyramidal numbers: a(n) = n*(n + 1)*(8*n - 5)/6.

Terms

a(0) =0a(1) =1a(2) =11a(3) =38a(4) =90a(5) =175a(6) =301a(7) =476a(8) =708a(9) =1005a(10) =1375a(11) =1826a(12) =2366a(13) =3003a(14) =3745a(15) =4600a(16) =5576a(17) =6681a(18) =7923a(19) =9310a(20) =10850a(21) =12551a(22) =14421a(23) =16468a(24) =18700a(25) =21125a(26) =23751a(27) =26586a(28) =29638a(29) =32915