Number of length n 1..(4+1) arrays with every leading partial sum divisible by 2, 3, 5 or 7.

A258627

Number of length n 1..(4+1) arrays with every leading partial sum divisible by 2, 3, 5 or 7.

Terms

    a(0) =4a(1) =20a(2) =80a(3) =264a(4) =809a(5) =2506a(6) =8432a(7) =30362a(8) =109520a(9) =391836a(10) =1408127a(11) =5002188a(12) =17308136a(13) =59463783a(14) =210199210a(15) =774578726a(16) =2918410859a(17) =10951007498a(18) =40430881133a(19) =146973680685a(20) =527988483182

External references