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) <= 4 for i = 2,...,k.
A356620
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) <= 4 for i = 2,...,k.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =11a(4) =26a(5) =56a(6) =115a(7) =230a(8) =453a(9) =884a(10) =1716a(11) =3321a(12) =6416a(13) =12383a(14) =23886a(15) =46060a(16) =88803a(17) =171194a(18) =330009a(19) =636136a(20) =1226216a(21) =2363633a(22) =4556076a(23) =8782147a(24) =16928162a(25) =32630112a(26) =62896595a(27) =121237118a(28) =233692093a(29) =450456028
External references
- oeis: A356620