A089940 Triangle read by rows: T(n,k)=binomial(n+k,floor((n-k)/2))

1, 1, 1, 2, 1, 1, 3, 4, 1, 1, 6, 5, 6, 1, 1, 10, 15, 7, 8, 1, 1, 20, 21, 28, 9, 10, 1, 1, 35, 56, 36, 45, 11, 12, 1, 1, 70, 84, 120, 55, 66, 13, 14, 1, 1, 126, 210, 165, 220, 78, 91, 15, 16, 1, 1, 252, 330, 495, 286, 364, 105, 120, 17, 18, 1, 1, 462, 792, 715, 1001, 455, 560, 136, 153

Offset

0,4

Links

Table of n, a(n) for n=0..73.

Crossrefs

Columns include A001405, A037955, A037956, A037957. Row sums are A089941.

Sequence in context: A210341 A160449 A326322 * A331598 A123974 A238350

Adjacent sequences: A089937 A089938 A089939 * A089941 A089942 A089943

Keyword

easy,nonn,tabl

Author

Paul Barry, Nov 16 2003

Status

approved