0,2

(PARI)

Cf. A128320 (triangle), A128321 (column 0), A128322 (column 1), A128324 (row sums); variant: A115083.

Sequence in context: A009413 A009429 A156236 this_sequence A074245 A064371 A009414

Adjacent sequences: A128320 A128321 A128322 this_sequence A128324 A128325 A128326

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Feb 25 2007