Number of permutations that end with a consecutive pattern 123, and avoid consecutive patterns 123 and 213 elsewhere.
A371943
Number of permutations that end with a consecutive pattern 123, and avoid consecutive patterns 123 and 213 elsewhere.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =10a(6) =28a(7) =116a(8) =388a(9) =1588a(10) =5960a(11) =25168a(12) =102856a(13) =453608a(14) =1985008a(15) =9163360a(16) =42486128a(17) =205065136a(18) =1000056928a(19) =5035366208a(20) =25689681760a(21) =134588839648a(22) =715328668736
External references
- oeis: A371943