A139796 Last term of A139687(n) with a fourth leading 1 = 1, 1, 1, 1, 2, 2, 1, 3, 5, 5 rows.

1, 1, 2, 5, 9, 28, 48, 165, 275, 1001, 1638, 6188

Offset

0,3

Comments

Based on sequences identical to their p-th differences.

Links

Table of n, a(n) for n=0..11.

Formula

Odd rows are 1; 1, 2, 2; 1, 3, 6, 9, 9; 1, 4, 10, 20, 34, 48, 48; 1, 5, 15, 35, 70, 125, 200, 275, 275; 1, 6, 21, 56, 126, 252, 461, 780, 1209, 1638, 1638; with respective sums second bisection a(2n+1)= 1, 5, 28, 165, 1001, 6188 = A025174(n+1)?

Crossrefs

Cf. A094600.

Sequence in context: A109742 A072979 A094600 * A086586 A105456 A364797

Adjacent sequences: A139793 A139794 A139795 * A139797 A139798 A139799

Keyword

nonn,uned

Author

Paul Curtz, Jun 14 2008

Status

approved