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URL: https://oeis.org/A078994

⇱ A078994 - OEIS

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A078994

Determinant of n X n matrix M(n) where m(i,i)=i if i>j, m(i,j)=i-j if j>i, m(i,j)=j-i.

0

1, 1, 1, -2, -24, -138, -500, 1200, 56256, 904912, 11937696, 144543360, 1639736320, 16965191808, 141946949376, 376837224448, -23412830208000, -860170849536000, -22132932250013696, -501053473607319552, -10543220910009286656, -208356118642682839040

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OFFSET

0,4

LINKS

Table of n, a(n) for n=0..21.

PROG

(PARI) a(n)=matdet(matrix(n, n, i, j, if(i-j, abs(i-j), i)))

CROSSREFS

Sequence in context: A045820 A098455 A261475 * A290775 A000185 A264566

Adjacent sequences: A078991 A078992 A078993 * A078995 A078996 A078997

KEYWORD

sign

AUTHOR

Benoit Cloitre, Jan 17 2003

STATUS

approved