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 A056666 #8 May 19 2024 12:46:12 %S A056666 70,134355076,886151997189981695113820646176823296, %T A056666 2182260405264094580008793131218399434811094697362043192997204611423155311899661247043911272024597983456098936160983083394199640518703547613585747214336 %N A056666 Number of equivalence classes of 4-valued Post functions of n variables under action of semi-direct product of symmetric group S_n and complementing group C(n,4). %D A056666 I. Strazdins, On the number of types of l-adic functions (in Russian), Proc. Riga Polytech. Inst. 10, No. 1 (1963), 167-186. %H A056666 M. A. Harrison and R. G. High, <a href="https://doi.org/10.1016/S0021-9800(68)80008-0">On the cycle index of a product of permutation groups</a>, J. Combin. Theory, 4 (1968), 277-299. See p. 296. %Y A056666 Cf. A000616, A001321, A001323, A001324. %K A056666 nonn %O A056666 1,1 %A A056666 _Vladeta Jovovic_, Aug 09 2000