Number of n-element subsets of {1,2,...,2n-1} whose elements sum to a multiple of n.

A145855

Number of n-element subsets of {1,2,...,2n-1} whose elements sum to a multiple of n.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =9a(4) =26a(5) =76a(6) =246a(7) =809a(8) =2704a(9) =9226a(10) =32066a(11) =112716a(12) =400024a(13) =1432614a(14) =5170604a(15) =18784169a(16) =68635478a(17) =252085792a(18) =930138522a(19) =3446167834a(20) =12815663844a(21) =47820414962a(22) =178987624514a(23) =671825133644

External references