This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A380240 #10 Jan 22 2025 15:46:13 %S A380240 1,1,2,3,1,4,12,8,2,10,48,64,25,3,26,196,412,314,78,6,80,798,2458, %T A380240 2976,1478,270,14,246,3248,13452,23588,18844,6748,926,34,810,13184, %U A380240 70330,166050,192096,110714,30168,3305,95,2704,53416,353716,1074472,1676668,1397484,613884,132734,11868,280,9252 %N A380240 Array read by antidiagonals: A(n,k) is the number of sensed planar maps with n vertices and k faces including one distinguished outside face, n >= 1, k >= 1. %C A380240 The number of edges is n + k - 2. %e A380240 Array begins: %e A380240 ============================================================== %e A380240 n\k | 1 2 3 4 5 6 7 8 ... %e A380240 ----+--------------------------------------------------------- %e A380240 1 | 1 1 2 4 10 26 80 246 ... %e A380240 2 | 1 3 12 48 196 798 3248 13184 ... %e A380240 3 | 1 8 64 412 2458 13452 70330 353716 ... %e A380240 4 | 2 25 314 2976 23588 166050 1074472 ... %e A380240 5 | 3 78 1478 18844 192096 1676668 ... %e A380240 6 | 6 270 6748 110714 1397484 ... %e A380240 7 | 14 926 30168 613884 ... %e A380240 8 | 34 3305 132734 ... %e A380240 ... %Y A380240 Columns 1..2 are A002995, A060404. %Y A380240 Rows 1..2 are A003239(n-1), A103943. %Y A380240 Antidiagonal sums are A103937. %Y A380240 Cf. A269920 (rooted), A379430 (sensed with no root). %K A380240 nonn,tabl %O A380240 1,3 %A A380240 _Andrew Howroyd_, Jan 21 2025