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, 6434

Offset

1,1

Links

Table of n, a(n) for n=1..8.

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

Cf. A089477.

Sequence in context: A012912 A018593 A255394 * A018627 A289671 A096853

Adjacent sequences: A081470 A081471 A081472 * A081474 A081475 A081476

Keyword

nonn,hard,more

Author

Jaap Spies, Nov 25 2003

Extensions

a(7) from Max Alekseyev, Sep 03 2023

a(8) from Jaap Spies, Feb 23 2026

Status

approved