An interleaved sequence of pyramidal and polygonal numbers.

Terms

a(0) =0a(1) =1a(2) =1a(3) =6a(4) =7a(5) =22a(6) =27a(7) =62a(8) =77a(9) =147a(10) =182a(11) =308a(12) =378a(13) =588a(14) =714a(15) =1044a(16) =1254a(17) =1749a(18) =2079a(19) =2794a(20) =3289a(21) =4290a(22) =5005a(23) =6370a(24) =7371a(25) =9191a(26) =10556a(27) =12936a(28) =14756a(29) =17816