A204236 Permanent of the n-th principal submatrix of A204154.

1, 11, 219, 8353, 501441, 43953387, 5289422019, 837277689897, 168675250704201, 42143281220724723, 12789052583333211963, 4633606346714879986017, 1975686665736618600155505, 979311369588813584600206491, 558412149326539306097214853299, 362948190926517939498607117046169

Offset

1,2

Links

Table of n, a(n) for n=1..16.

Mathematica

f[i_, j_] := Max[2 i - j, 2 j - i];  (* A204154 *)
m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]
TableForm[m[6]] (* 6x6 principal submatrix *)
Permanent[m_] :=
  With[{a = Array[x, Length[m]]},
   Coefficient[Times @@ (m.a), Times @@ a]];
Table[Permanent[m[n]], {n, 1, 14}]    (* A204236 *)

Crossrefs

Cf. A204154.

Sequence in context: A214687 A160074 A298889 * A035012 A179339 A055411

Adjacent sequences: A204233 A204234 A204235 * A204237 A204238 A204239

Keyword

nonn

Author

Clark Kimberling, Jan 13 2012

Extensions

a(15)-a(16) from Pontus von Brömssen, Mar 03 2024

Status

approved