A249390
The number of down-up permutations of [n] where adjacent elements differ by at least 3.
Original entry on oeis.org
1, 1, 0, 0, 0, 0, 1, 8, 68, 480, 3637, 27968, 231410, 2014784, 18789010, 185234176, 1943243785, 21501237248, 251589065328, 3093350098432, 40007001803593, 541652523341824, 7679190979467688, 113578314941202432
Offset: 0
A249391
The number of down-up permutations of [n] where adjacent elements differ by at least 4.
Original entry on oeis.org
1, 1, 0, 0, 0, 0, 0, 0, 1, 16, 272, 2880, 32648, 333696, 3617545, 38942336, 443291226, 5168682752, 63523977424, 807890646528, 10790865576074, 149552304296960, 2168856599259491, 32631738808727552, 512002155247238968
Offset: 0
A249393
The number of down-up permutations of [n] where adjacent elements differ by at least 6.
Original entry on oeis.org
1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 64, 4352, 103680, 2644488, 48052224, 922764744, 15466088448, 271484691944, 4512300607488, 78169637107873, 1332149989277696, 23596090882390538
Offset: 0
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