a(n) = (-1)^n * hypergeom([-n, n/2 + 1, n/2 + 1/2], [1, n + 2], 4). Central terms of A379907.

A379823

a(n) = (-1)^n * hypergeom([-n, n/2 + 1, n/2 + 1/2], [1, n + 2], 4). Central terms of A379907.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =17a(4) =76a(5) =352a(6) =1667a(7) =8017a(8) =38992a(9) =191276a(10) =944648a(11) =4690688a(12) =23396023a(13) =117130483a(14) =588267604a(15) =2962532945a(16) =14954741680a(17) =75647585152a(18) =383359922324

External references