The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A360848 Number of dominating induced trees in the n-ladder graph P_2_X P_n. 2
 3, 8, 17, 32, 66, 130, 262, 522, 1046, 2090, 4182, 8362, 16726, 33450, 66902, 133802, 267606, 535210, 1070422, 2140842, 4281686, 8563370, 17126742, 34253482, 68506966, 137013930, 274027862, 548055722, 1096111446, 2192222890, 4384445782, 8768891562 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..1000 Eric Weisstein's World of Mathematics, Ladder Graph. Index entries for linear recurrences with constant coefficients, signature (1,2). FORMULA a(n) = a(n-1) + 2*a(n-2) for n > 4. G.f.: x*(3 + 5*x + 3*x^2 - x^3)/((1 + x)*(1 - 2*x)). PROG (PARI) Vec((3 + 5*x + 3*x^2 - x^3)/((1 + x)*(1 - 2*x)) + O(x^20)) CROSSREFS Row 2 of A360846. Sequence in context: A293057 A294417 A001580 * A002625 A027181 A130750 Adjacent sequences: A360845 A360846 A360847 * A360849 A360850 A360851 KEYWORD nonn,easy AUTHOR Andrew Howroyd, Feb 23 2023 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 4 13:44 EDT 2024. Contains 374923 sequences. (Running on oeis4.)