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 A004305 M3091 #28 May 19 2024 08:04:33 %S A004305 3,22,85,254,644,1448,2967,5645,10109,17214,28093,44212,67430,100064, %T A004305 144959,205563,286007,391190,526869,699754,917608,1189352,1525175, %U A004305 1936649,2436849,3040478,3763997,4625760,5646154,6847744,8255423,9896567,11801195,14002134,16535189,19439318,22756812,26533480,30818839 %N A004305 Simple triangulations of a disk: column 4 of square array in A210664. %D A004305 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A004305 Andrew Howroyd, <a href="/A004305/b004305.txt">Table of n, a(n) for n = 0..1000</a> %H A004305 P. N. Rathie, <a href="https://doi.org/10.1016/0095-8956(74)90055-0">A census of simple planar triangulations</a>, J. Combin. Theory, B 16 (1974), 134-138. %F A004305 a(n) = (n^6 + 15*n^5 + 103*n^4 + 405*n^3 + 976*n^2 + 1236*n + 432)/144. %Y A004305 Cf. A210664. %K A004305 nonn %O A004305 0,1 %A A004305 _N. J. A. Sloane_ %E A004305 Entry revised by _N. J. A. Sloane_, Mar 27 2012