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A144271 Row sums of triangle A144270 (called S2hat(-1)). 2
1, 2, 5, 21, 129, 1099, 11647, 148292, 2190302, 36842892, 694276152, 14488348603, 331537914373, 8254117606799, 222087256536602, 6421589319659283, 198565371839434761, 6538245667687424041, 228396692050813678534, 8436237099236470594589 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

FORMULA

a(n)=sum(A144270(n,m),m=1..n), n>=1.

CROSSREFS

Sequence in context: A243272 A139153 A180998 * A193189 A176527 A117261

Adjacent sequences:  A144268 A144269 A144270 * A144272 A144273 A144274

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang Oct 09 2008

STATUS

approved

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Last modified August 6 19:52 EDT 2020. Contains 336256 sequences. (Running on oeis4.)