A278844 a(n) = permanent M_n where M_n is the n X n matrix m(i,j) = (Catalan(i+j))^2.

1, 4, 1409, 61813936, 405546824579185, 444429790193462299152820, 87560380592182813232163111416947497, 3267701159348966740482726536189228228570094452288, 24017165813923278639658993746183865352216465064857235206429739929

Offset

0,2

Links

Table of n, a(n) for n=0..8.

Mathematica

Flatten[{1, Table[Permanent[Table[CatalanNumber[i+j]^2, {i, 1, n}, {j, 1, n}]], {n, 1, 12}]}]

Crossrefs

Cf. A000108, A277829, A278770, A278843.

Sequence in context: A167071 A274296 A283103 * A036107 A201390 A030271

Adjacent sequences: A278841 A278842 A278843 * A278845 A278846 A278847

Keyword

nonn

Author

Vaclav Kotesovec, Nov 29 2016

Status

approved