Form a triangle with the numbers [0..n] on the base, where each number is the sum of the two below; a(n) is the number of different possible values for the apex.
A066411
Form a triangle with the numbers [0..n] on the base, where each number is the sum of the two below; a(n) is the number of different possible values for the apex.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =23a(5) =61a(6) =143a(7) =215a(8) =995a(9) =2481a(10) =5785a(11) =12907a(12) =29279a(13) =64963a(14) =144289a(15) =158049a(16) =683311a(17) =1471123a(18) =3166531a(19) =6759177a(20) =14404547a(21) =30548713a(22) =64621847a(23) =136029689a(24) =286668247a(25) =601780081a(26) =1260394425a(27) =2634401067a(28) =5497073373a(29) =11449386791
External references
- oeis: A066411