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 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). 10
 0, 8, 92, 596, 1936, 6020, 11088, 26260, 42144, 72296, 107832, 183340, 222940, 371100, 466936, 609916, 804504, 1139632, 1288536, 1813288, 2012676, 2536572, 3142008, 3997580, 4230340, 5430444, 6331892, 7360512, 8262568, 10367804 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS By Euler's formula, a(n) = A331449(n) + A255011(n) - 1. LINKS Lars Blomberg, Table of n, a(n) for n = 0..52 CROSSREFS Cf. A255011, A331449. For the circular analog see A006533, A007678, A007569, A135565. Sequence in context: A303743 A187157 A332597 * A215057 A222400 A358884 Adjacent sequences: A331445 A331446 A331447 * A331449 A331450 A331451 KEYWORD nonn AUTHOR N. J. A. Sloane, Jan 23 2020, based on a comment from Michael De Vlieger in A255011. EXTENSIONS a(11)-a(29) from Giovanni Resta, Jan 28 2020 STATUS approved

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Last modified July 13 04:46 EDT 2024. Contains 374267 sequences. (Running on oeis4.)