Column k=4 sequence of array A103728.

Terms

a(0) =1a(1) =13a(2) =191a(3) =457a(4) =1713a(5) =2899a(6) =6997a(7) =19769a(8) =26521a(9) =57313a(10) =89161a(11) =109327a(12) =159713a(13) =265617a(14) =417079a(15) =479641a(16) =709963a(17) =903981a(18) =1014697a(19) =1408369a(20) =1727987a(21) =2305689a(22) =3287713a(23) =3882401a(24) =4208317a(25) =4921263a(26) =5309929a(27) =6155857a(28) =9930313a(29) =11272171