Structured hexagonal anti-prism numbers.

Terms

a(0) =1a(1) =12a(2) =46a(3) =116a(4) =235a(5) =416a(6) =672a(7) =1016a(8) =1461a(9) =2020a(10) =2706a(11) =3532a(12) =4511a(13) =5656a(14) =6980a(15) =8496a(16) =10217a(17) =12156a(18) =14326a(19) =16740a(20) =19411a(21) =22352a(22) =25576a(23) =29096a(24) =32925a(25) =37076a(26) =41562a(27) =46396a(28) =51591a(29) =57160