Sequences n*(n+1)*(6*n+1)/2 and n*(n+1)*(7*n+1)/2 interleaved.

Terms

a(0) =0a(1) =7a(2) =8a(3) =39a(4) =45a(5) =114a(6) =132a(7) =250a(8) =290a(9) =465a(10) =540a(11) =777a(12) =903a(13) =1204a(14) =1400a(15) =1764a(16) =2052a(17) =2475a(18) =2880a(19) =3355a(20) =3905a(21) =4422a(22) =5148a(23) =5694a(24) =6630a(25) =7189a(26) =8372a(27) =8925a(28) =10395a(29) =10920