Number of permutations of floor(i*9/8), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
A147907
Number of permutations of floor(i*9/8), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =16a(4) =54a(5) =232a(6) =936a(7) =3880a(8) =23002a(9) =127008a(10) =751100a(11) =4670780a(12) =29781390a(13) =193211704a(14) =1334448490a(15) =9604883174
External references
- oeis: A147907