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A208446
Duplicate of A172634.
1
1, 1, 7, 31, 175, 991, 5881, 35617, 219871, 1376095, 8710537, 55644337, 358198369, 2320792657, 15120204295, 98984058271, 650725327231, 4293779332927, 28425752310361, 188739799967425, 1256510215733185
OFFSET
0,3
CROSSREFS
Sequence in context: A188233 A319457 A264608 * A172634 A322205 A139151
KEYWORD
dead
STATUS
approved