OFFSET
1,2
COMMENTS
A meander is a closed curve drawn by arcs of equal length and central angle of equal magnitude, starting with a positively oriented arc.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..482
Peter Luschny, Meander.
FORMULA
T(n,k) = A198060(d-1,n/d-1) where d is the k-th divisor of n (the divisors in natural order).
EXAMPLE
[ 1] 1
[ 2] 2, 1
[ 3] 4, 1
[ 4] 8, 3, 1
[ 5] 16, 1
[ 6] 32, 10, 4, 1
[ 7] 64, 1
[ 8] 128, 35, 5, 1
[ 9] 256, 22, 1
[10] 512, 126, 6, 1
[11] 1024, 1
[12] 2048, 462, 134, 46, 7, 1
MAPLE
MATHEMATICA
A198060[m_, n_] := Sum[Sum[Sum[(-1)^(j+i)*Binomial[i, j]*Binomial[n, k]^(m+1)*(n+1)^j*(k+1)^(m-j)/(k+1)^m, {i, 0, m}], {j, 0, m}], {k, 0, n}]; row[n_] := Table[A198060[d-1, n/d-1], {d, Divisors[n]}]; Table[row[n], {n, 1, 20}] // Flatten (* Jean-François Alcover, Feb 25 2014, after Maple *)
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Peter Luschny, Nov 20 2011
STATUS
approved