A026392 T(n,[ n/2 ]), where T is the array in A026386.

1, 2, 4, 8, 17, 34, 75, 150, 339, 678, 1558, 3116, 7247, 14494, 34016, 68032, 160795, 321590, 764388, 1528776, 3650571, 7301142, 17501619, 35003238, 84179877, 168359754, 406020930, 812041860, 1963073865, 3926147730

Offset

1,2

Links

Table of n, a(n) for n=1..30.

Paul Barry, Extensions of Riordan Arrays and Their Applications, Mathematics (2025) Vol. 13, No. 2, 242. See p. 15.

Formula

Conjecture: (n+1)*a(n) +2*(n-1)*a(n-1) +2*(-3*n+1)*a(n-2) +4*(-3*n+7)*a(n-3) +5*(n-3)*a(n-4) +10*(n-5)*a(n-5)=0. - R. J. Mathar, Feb 10 2015

Maple

A026392 := proc(n)
    A026386(n, floor(n/2)) ;
end proc: # R. J. Mathar, Feb 10 2015

Crossrefs

Cf. A026378, A085362.

Sequence in context: A018093 A214083 A026743 * A266897 A018094 A293331

Adjacent sequences: A026389 A026390 A026391 * A026393 A026394 A026395

Keyword

nonn

Author

Clark Kimberling

Extensions

Offset corrected. R. J. Mathar, Feb 10 2015

Status

approved