A159928 a(n) is the sum of the terms of row n of triangle A159927.

1, 3, 15, 91, 641, 5147, 46433, 465081, 5121789, 61513799, 800196799, 11208394387, 168193068805, 2691956450679, 45775335405729, 824136306116113, 15661462041469817, 313277888390065739, 6579708440058166031

Offset

1,2

Comments

a(n) = -A075374(n+4) + A075374(n+3), for n >= 1; -A075374(n+4) = the sum of all terms of triangle A159927 in rows 1 through n.

Links

Table of n, a(n) for n=1..19.

Prog

(Magma) S:=[1]; T:=S; s:=1; for m in [2..19] do T:=[ n lt m select T[n]+s else s: n in [1..m] ]; t:=&+T; s+:=t; Append(~S, t); end for; S; // Klaus Brockhaus, Jun 02 2009

Crossrefs

Cf. A159927, A075374.

Sequence in context: A006632 A366056 A369161 * A020018 A124553 A369623

Adjacent sequences: A159925 A159926 A159927 * A159929 A159930 A159931

Keyword

nonn

Author

Leroy Quet, Apr 26 2009

Extensions

More terms from Klaus Brockhaus, Jun 02 2009

Status

approved