cp's OEIS Frontend

A330848 Table read by rows: T(n,k) = number of k-sided polygons in a cross with width 3 and height n (see Comments in A331455 for definition) for k = 3,4,5.

%I A330848 #30 Jun 02 2025 15:23:07
%S A330848 50,14,0,84,20,0,132,42,2,188,116,0,290,202,0,428,350,0,634,542,0,890,
%T A330848 840,2,1290,1156,0,1776,1640,0,2392,2220,2,3108,3064,0,4112,3946,2,
%U A330848 5260,5076,4,6696,6350,6,8308,8072,8,10334,9886,8,12588,12256,8
%N A330848 Table read by rows: T(n,k) = number of k-sided polygons in a cross with width 3 and height n (see Comments in A331455 for definition) for k = 3,4,5.
%C A330848 See the links in A331455 for images of the crosses.
%H A330848 Lars Blomberg, <a href="/A330848/b330848.txt">Table of n, a(n) for n = 1..147</a> (the first 49 rows)
%e A330848 Table begins:
%e A330848 50, 14, 0
%e A330848 84, 20, 0
%e A330848 132, 42, 2
%e A330848 188, 116, 0
%e A330848 290, 202, 0
%e A330848 428, 350, 0
%e A330848 634, 542, 0
%e A330848 890, 840, 2
%e A330848 1290, 1156, 0
%e A330848 The row sums are A331455.
%Y A330848 Cf. A331455 (regions), A330850 (vertices), A330851 (edges), A333037 (cross with equal length arms).
%K A330848 nonn,tabf
%O A330848 1,1
%A A330848 _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 07 2020
%E A330848 a(28) and beyond from _Lars Blomberg_, May 31 2020