a(n) = (binomial(n,floor(n/2)))/(greatest common divisor of all numbers in n-th row of Pascal's triangle excluding 1 and n).

A327703

a(n) = (binomial(n,floor(n/2)))/(greatest common divisor of all numbers in n-th row of Pascal's triangle excluding 1 and n).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =5a(4) =5a(5) =21a(6) =84a(7) =42a(8) =84a(9) =132a(10) =264a(11) =6435a(12) =6435a(13) =715a(14) =2860a(15) =4862a(16) =9724a(17) =352716a(18) =705432a(19) =58786a(20) =117572a(21) =1040060a(22) =2080120a(23) =6686100a(24) =13372200a(25) =2674440a(26) =5348880a(27) =9694845a(28) =9694845a(29) =583401555

External references