A049617 a(n) = Sum_{i=0..2n} (-1)^i * T(i,2n-i) where T is A049615.

0, 2, 5, 8, 13, 18, 23, 30, 39, 46, 55, 66, 75, 88, 101, 110, 127, 144, 157, 176, 193, 206, 227, 250, 267, 288, 313, 332, 357, 386, 403, 434, 467, 488, 521, 546, 571, 608, 645, 670, 703, 744, 769, 812, 853, 878, 923, 970, 1003, 1046, 1087

Offset

0,2

Links

Table of n, a(n) for n=0..50.

Maple

A049617 := proc(n)
    add((-1)^i*A049615(i, 2*n-i), i=0..2*n) ;
end proc: # R. J. Mathar, Oct 26 2015

Crossrefs

Sequence in context: A332774 A256829 A342431 * A375996 A054074 A290268

Adjacent sequences: A049614 A049615 A049616 * A049618 A049619 A049620

Keyword

nonn

Author

Clark Kimberling

Status

approved