A081473 - OEIS

A081473

Smallest positive even number not the permanent of a real singular (0,1)-matrix of order n.

2, 4, 8, 16, 44, 194, 946

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

EXAMPLE

a(4) = 16, see permanent frequency table: (0,27713), (2,9360), (4,3582), (6,1248), (8,648), (10,288), (12,48), (14,72), (18,16), (24,1).

CROSSREFS

KEYWORD

hard,more,nonn

AUTHOR

Jaap Spies, Nov 25 2003

EXTENSIONS

a(7) from Max Alekseyev, Sep 03 2023

STATUS

approved