A000646 - OEIS

%I M0800 N0303 #18 Feb 01 2022 01:07:23

%S 1,2,3,6,13,28,62,144,338,810,1970,4852,12073,30334,76805,195850,

%T 502461,1296122,3359527,8745744,22856223,59944156,157718380,416189954,

%U 1101204387,2920914484,7765357967,20688204244,55225188289,147688302518

%N Number of alkyls Y^{II} C_n H_{2n+2} with n carbon atoms.

%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H G. Polya, <a href="http://dx.doi.org/10.1524/zkri.1936.93.1.415">Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen</a>, Zeit. f. Kristall., 93 (1936), 415-443; line 12 of Table I.

%H G. Polya, <a href="/A000598/a000598_3.pdf">Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen</a>,  Zeit. f. Kristall., 93 (1936), 415-443; Table I, line 12. (Annotated scanned copy)

%F G.f.: A(x) = A000598(x)^2.

%K nonn,easy

%O 0,2

%A _N. J. A. Sloane_