A089595 Table T(n,k), n>=0 and k>=0: Stern's diatomic array read by antidiagonals (version 5).

1, 0, 1, -1, 1, 1, -3, 0, 2, 1, -2, -1, 1, 3, 1, -7, -1, 1, 2, 4, 1, -5, -4, 0, 3, 3, 5, 1, -8, -3, -1, 1, 5, 4, 6, 1, -3, -5, -1, 2, 2, 7, 5, 7, 1, -13, -2, -2, 1, 5, 3, 9, 6, 8, 1, -10, -9, -1, 1, 3, 8, 4, 11, 7, 9, 1, -17, -7, -5, 0, 4, 5, 11, 5, 13, 8, 10, 1, -7, -12, -4, -1, 1, 7, 7, 14, 6, 15, 9, 11, 1, -18, -5, -7, -1, 3, 2, 10, 9, 17, 7

Offset

0,7

Links

Table of n, a(n) for n=0..100.

Formula

Each row is obtained by copying the previous row but interpolating the sum of pairs of adjacent terms.

T(n, 2*k) = T(n-1, k) = T(n, k) - A002487(k).

T(n, 2*k+1) = T(n, 2*k) + T(n, 2*k+2); T(0, 0)=1, T(0, 1)=0.

The k-th column is an arithmetic progression with : T(n, k) = T(0, k) + n* A002487(k).

Example

row n=0 : 1, 0, -1, -3, -2, -7, -5, -8, -3, -13, -10, -17, -7, -18, -11, ...
row n=1 : 1, 1, 0, -1, -1, -4, -3, -5, -2, -9, -7, -12, -5, -13, ...
row n=2 : 1, 2, 1, 1, 0, -1, -1, -2, -1, -5, -4, -7, -3, ...
row n=3 : 1, 3, 2, 3, 1, 2, 1, 1, 0, -1, -1, -2, -1, ...
row n=4 : 1, 4, 3, 5, 2, 5, 3, 4, 1, 3, 2, 3, 1, ...

Crossrefs

Cf. A049456, A070878, A070879, A049455, A002487.

Sequence in context: A100950 A359867 A021335 * A238133 A317922 A337320

Adjacent sequences: A089592 A089593 A089594 * A089596 A089597 A089598

Keyword

sign,tabl

Author

Philippe Deléham, Dec 30 2003

Status

approved