Triangle read by rows: number of circular permutations of [1..n] with k progressions of rise 1, distance 1 and length 3 (n >= 3, k >= 0).
A216718
Triangle read by rows: number of circular permutations of [1..n] with k progressions of rise 1, distance 1 and length 3 (n >= 3, k >= 0).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =5a(4) =0a(5) =1a(6) =20a(7) =3a(8) =0a(9) =1a(10) =102a(11) =14a(12) =3a(13) =0a(14) =1a(15) =627a(16) =72a(17) =17a(18) =3a(19) =0a(20) =1a(21) =4461a(22) =468a(23) =87a(24) =20a(25) =3a(26) =0a(27) =1a(28) =36155a(29) =3453
External references
- oeis: A216718