1,7

Row n has 3n+1 terms.

Gottfried Helms, Comments on A136206 and A136248

Triangle begins:

1

1 1 1 1

1 3 4 6 4 3 1

1 7 13 26 31 31 25 13 6 1

1 15 40 100 171 220 255 215 156 85 35 10 1

Adjacent sequences: A136245 A136246 A136247 this_sequence A136249 A136250 A136251

Sequence in context: A065446 A055173 A010469 this_sequence A101432 A098744 A023823

nonn,tabf

Gottfried Helms (helms(AT)uni-kassel.de), Apr 16 2008