A110950 - OEIS

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A110950

a(n) = permanent of an n X n matrix M of zeros and ones defined as follows: if we concatenate the rows of M to form a vector v of length n^2, v_i = 0 if i is prime and v_i = 1, otherwise.

%I #10 Sep 11 2024 15:44:52

%S 1,3,12,36,383,1560,19162,97680,1804643,4082400,207316912,1186043040,

%T 25595629200,266545072080,6282386337194,26013379392000,

%U 1682187039875545,11884755543091200,396276417247253760,5491416186030297600

%N a(n) = permanent of an n X n matrix M of zeros and ones defined as follows: if we concatenate the rows of M to form a vector v of length n^2, v_i = 0 if i is prime and v_i = 1, otherwise.

%o (PARI) a(n)=my(A=matrix(n,n,i,j,!isprime(n*(i-1)+j))); matpermanent(A) \\ Herman Jamke (hermanjamke(AT)fastmail.fm), May 14 2007

%K nonn

%O 3,2

%A _Simone Severini_, Sep 25 2005

%E More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 14 2007