A321628 Row sums of A321627.

1, 2, 8, 44, 308, 2660, 27764, 343604, 4948196, 81477188, 1510645556, 31133831540, 705725536868, 17441324917508, 466571232425012, 13427966856358196, 413627214916715492, 13576185998718106820, 472963964292142718516, 17429043637241263344116, 677320641352700988657764

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Maple

b := proc(n) option remember; if n = 0 then 2 else
add(doublefactorial(2*k-1)*b(n-k), k=1..n) fi end:
a := n -> if n = 0 then return 1 else b(n) end: seq(a(n), n=0..20);

Crossrefs

Cf. A321627, A193763.

Sequence in context: A005649 A253950 A212913 * A005363 A216234 A123307

Adjacent sequences: A321625 A321626 A321627 * A321629 A321630 A321631

Keyword

nonn

Author

Peter Luschny, Dec 07 2018

Status

approved