Partial sums of dodecahedral numbers (A006566).

Terms

a(0) =0a(1) =1a(2) =21a(3) =105a(4) =325a(5) =780a(6) =1596a(7) =2926a(8) =4950a(9) =7875a(10) =11935a(11) =17391a(12) =24531a(13) =33670a(14) =45150a(15) =59340a(16) =76636a(17) =97461a(18) =122265a(19) =151525a(20) =185745a(21) =225456a(22) =271216a(23) =323610a(24) =383250a(25) =450775a(26) =526851a(27) =612171a(28) =707455a(29) =813450