a(0) = 0 by convention; for n>0, a(n) is the number of edges in the n-th figure shown in A255011 (meaning the figure with 4n points on the perimeter).

A331448

a(0) = 0 by convention; for n>0, a(n) is the number of edges in the n-th figure shown in A255011 (meaning the figure with 4n points on the perimeter).

Terms

    a(0) =0a(1) =8a(2) =92a(3) =596a(4) =1936a(5) =6020a(6) =11088a(7) =26260a(8) =42144a(9) =72296a(10) =107832a(11) =183340a(12) =222940a(13) =371100a(14) =466936a(15) =609916a(16) =804504a(17) =1139632a(18) =1288536a(19) =1813288a(20) =2012676a(21) =2536572a(22) =3142008a(23) =3997580a(24) =4230340a(25) =5430444a(26) =6331892a(27) =7360512a(28) =8262568a(29) =10367804

External references