a(n) = number of k-tuples (u(1), u(2), ..., u(k)) with 1 <= u(1) < u(2) < ... < u(k) <= n such that u(i) - u(i-1) <= 3 for i = 2,...,k.
A356619
a(n) = number of k-tuples (u(1), u(2), ..., u(k)) with 1 <= u(1) < u(2) < ... < u(k) <= n such that u(i) - u(i-1) <= 3 for i = 2,...,k.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =11a(4) =25a(5) =52a(6) =103a(7) =198a(8) =374a(9) =699a(10) =1298a(11) =2401a(12) =4431a(13) =8166a(14) =15037a(15) =27676a(16) =50924a(17) =93685a(18) =172336a(19) =316999a(20) =583077a(21) =1072472a(22) =1972611a(23) =3628226a(24) =6673378a(25) =12274287a(26) =22575966a(27) =41523709a(28) =76374043a(29) =140473802
External references
- oeis: A356619