OFFSET
1,2
COMMENTS
From the classic story: number of grains of wheat on last square of n X n chessboard.
The number of compositions of n^2. - Alois P. Heinz, Feb 22 2020
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..50
Peter Kagey and William Keehn, Counting Tilings of the n X m Grid, Cylinder, and Torus, J. Int. Seq. (2024) Vol. 27, Art. No. 24.6.1. See section A, pp. 6, 10.
FORMULA
MAPLE
[seq(2^(n^2-1), n=1..14)];
MATHEMATICA
Table[2^(n^2 - 1), {n, 1, 20}] (* Vincenzo Librandi, Feb 25 2014 *)
PROG
(PARI) a(n) = 2^(n^2-1); \\ Joerg Arndt, Feb 23 2014
(Magma) [2^(n^2-1): n in [1..15]]; // Vincenzo Librandi, Feb 25 2014
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Zerinvary Lajos, Jul 30 2006
STATUS
approved